SM UC-21

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SM UC-21

Quality:

SM UC-21 - 1916 Type UC II submarine. Article “SM UC-21” in English Wikipedia has 28.8 points for quality (as of July 1, 2025). The article contains 17 references and 5 sections.

This article has the best quality in Polish Wikipedia. However, this article is the most popular in English version.

Since the creation of article “SM UC-21”, its content was written by 24 registered users of English Wikipedia and edited by 56 registered Wikipedia users in all languages.

The article is cited 113 times in English Wikipedia and cited 983 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (English): #196574 in September 2009
  • Global: #111948 in November 2023

The highest popularity rank from 2008:

  • Local (English): #1113146 in July 2014
  • Global: #788591 in November 2016

There are 7 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

Languages with the highest quality

#LanguageQuality gradeQuality score
1Polish (pl)
SM UC-21
76.4923
2Chinese (zh)
UC-21号潜艇
39.7323
3English (en)
SM UC-21
28.7742
4French (fr)
Unterseeboot UC-21
14.5602
5Dutch (nl)
UC-21
9.9192
6Arabic (ar)
غواصة يو سي-21
9.7275
7Persian (fa)
اس‌ام یوسی-۲۱
1.2138
More...

The following table shows the most popular language versions of the article.

Most popular in all the time

The most popular language versions of the article "SM UC-21" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
SM UC-21
29 931
2Dutch (nl)
UC-21
3 111
3Polish (pl)
SM UC-21
2 759
4Chinese (zh)
UC-21号潜艇
2 163
5Arabic (ar)
غواصة يو سي-21
488
6Persian (fa)
اس‌ام یوسی-۲۱
444
7French (fr)
Unterseeboot UC-21
164
More...

The following table shows the language versions of the article with the highest popularity in the last month.

Most popular in June 2025

The most popular language versions of the article "SM UC-21" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
SM UC-21
121
2Chinese (zh)
UC-21号潜艇
40
3Dutch (nl)
UC-21
12
4Polish (pl)
SM UC-21
7
5French (fr)
Unterseeboot UC-21
6
6Arabic (ar)
غواصة يو سي-21
4
7Persian (fa)
اس‌ام یوسی-۲۱
4
More...

The following table shows the language versions of the article with the highest Authors’ Interest.

The highest AI

Language versions of the article "SM UC-21" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
SM UC-21
24
2Dutch (nl)
UC-21
15
3Polish (pl)
SM UC-21
9
4French (fr)
Unterseeboot UC-21
3
5Chinese (zh)
UC-21号潜艇
3
6Arabic (ar)
غواصة يو سي-21
1
7Persian (fa)
اس‌ام یوسی-۲۱
1
More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

The highest AI in June 2025

Language versions of the article "SM UC-21" with the highest AI in June 2025
#LanguageAI awardRelative AI
1Arabic (ar)
غواصة يو سي-21
0
2English (en)
SM UC-21
0
3Persian (fa)
اس‌ام یوسی-۲۱
0
4French (fr)
Unterseeboot UC-21
0
5Dutch (nl)
UC-21
0
6Polish (pl)
SM UC-21
0
7Chinese (zh)
UC-21号潜艇
0
More...

The following table shows the language versions of the article with the highest number of citations.

The highest CI

Language versions of the article "SM UC-21" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1Chinese (zh)
UC-21号潜艇
409
2Arabic (ar)
غواصة يو سي-21
304
3English (en)
SM UC-21
113
4French (fr)
Unterseeboot UC-21
70
5Polish (pl)
SM UC-21
68
6Persian (fa)
اس‌ام یوسی-۲۱
16
7Dutch (nl)
UC-21
3
More...

Scores

Estimated value for Wikipedia:
English:
Global:
Popularity in June 2025:
English:
Global:
Popularity in all years:
English:
Global:
Authors in June 2025:
English:
Global:
Registered authors in all years:
English:
Global:
Citations:
English:
Global:

Quality measures

Interwikis

#LanguageValue
arArabic
غواصة يو سي-21
enEnglish
SM UC-21
faPersian
اس‌ام یوسی-۲۱
frFrench
Unterseeboot UC-21
nlDutch
UC-21
plPolish
SM UC-21
zhChinese
UC-21号潜艇

Popularity rank trends

Best Rank English:
#1113146
07.2014
Global:
#788591
11.2016

AI rank trends

Best Rank English:
#196574
09.2009
Global:
#111948
11.2023

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on SM UC-21 from Wikipedia articles about SS Donegal, American entry into World War I, Type UC II submarine, SM UC-17 and List of shipwrecks in March 1917. Whereas reading the article about SM UC-21 people most often go to Wikipedia articles on List of shipwrecks in March 1917, SS Donegal, Type UC II submarine, List of shipwrecks in September 1917 and American entry into World War I.

Cumulative results of quality and popularity of the Wikipedia article

List of Wikipedia articles in different languages (starting with the most popular):

nl: UC-21

News from 21 February 2026

On 21 February 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: Jeffrey Epstein, Alysa Liu, Eric Dane, 2026 Winter Olympics, Rebecca Gayheart, Johannes Høsflot Klæbo, Wuthering Heights, amyotrophic lateral sclerosis, Andrew Mountbatten-Windsor, John F. Kennedy Jr..

In English Wikipedia the most popular articles on that day were: Eric Dane, Alysa Liu, Rebecca Gayheart, Jeffrey Epstein, 2026 Winter Olympics, Eileen Gu, John F. Kennedy Jr., Carolyn Bessette Kennedy, Deaths in 2026, Johannes Høsflot Klæbo.

About WikiRank

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information