P21

Cyclin dependent kinase inhibitor 1A - mammalian protein found in Homo sapiens. Article “P21” in French Wikipedia has 28.1 points for quality (as of July 1, 2026). The article contains 8 references and 1 sections.

This article has the best quality in English Wikipedia. Also, this article is the most popular in that (French) language version.

Since the creation of article “P21”, its content was written by 8 registered users of French Wikipedia and edited by 184 registered Wikipedia users in all languages.

The article is cited 19 times in French Wikipedia and cited 489 times in all languages.

The highest Authors Interest rank from 2001:

• Local (French): #75765 in March 2015
• Global: #86427 in April 2013

The highest popularity rank from 2008:

• Local (French): #170569 in December 2017
• Global: #132092 in April 2015

There are 15 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, 2026 (including revision history and pageviews for previous years).

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

#	Language	Quality grade	Quality score
1	English (en) P21		78.1213
2	Polish (pl) P21		36.0631
3	Japanese (ja) P21		34.5667
4	Italian (it) P21		33.7785
5	French (fr) P21		28.0761
6	German (de) CDK-Inhibitor 1		22.6295
7	Ukrainian (uk) CDKN1A		19.6161
8	Spanish (es) P21		17.1008
9	Czech (cs) P21		15.6554
10	Russian (ru) CDKN1A		15.175

More...

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

The most popular language versions of the article "P21" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) P21		1 186 082
2	Spanish (es) P21		123 371
3	Japanese (ja) P21		109 672
4	Italian (it) P21		76 944
5	German (de) CDK-Inhibitor 1		64 747
6	Polish (pl) P21		57 232
7	Portuguese (pt) P21		36 322
8	French (fr) P21		30 839
9	Russian (ru) CDKN1A		25 626
10	Korean (ko) P21		22 678

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

The most popular language versions of the article "P21" in June 2026

#	Language	Popularity award	Relative popularity
1	English (en) P21		1 137
2	Japanese (ja) P21		137
3	French (fr) P21		76
4	Spanish (es) P21		74
5	German (de) CDK-Inhibitor 1		68
6	Polish (pl) P21		53
7	Italian (it) P21		51
8	Korean (ko) P21		43
9	Czech (cs) P21		28
10	Russian (ru) CDKN1A		22

More...

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

Language versions of the article "P21" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) P21		62
2	German (de) CDK-Inhibitor 1		29
3	Italian (it) P21		18
4	Polish (pl) P21		13
5	Spanish (es) P21		10
6	Japanese (ja) P21		10
7	Russian (ru) CDKN1A		9
8	French (fr) P21		8
9	Finnish (fi) P21 (proteiini)		7
10	Portuguese (pt) P21		7

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

Language versions of the article "P21" with the highest AI in June 2026

#	Language	AI award	Relative AI
1	English (en) P21		2
2	Italian (it) P21		1
3	Czech (cs) P21		0
4	German (de) CDK-Inhibitor 1		0
5	Spanish (es) P21		0
6	Finnish (fi) P21 (proteiini)		0
7	French (fr) P21		0
8	Indonesian (id) P21		0
9	Japanese (ja) P21		0
10	Korean (ko) P21		0

More...

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

Language versions of the article "P21" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	English (en) P21		189
2	Russian (ru) CDKN1A		62
3	Japanese (ja) P21		52
4	Spanish (es) P21		34
5	Czech (cs) P21		32
6	Korean (ko) P21		29
7	Ukrainian (uk) CDKN1A		24
8	French (fr) P21		19
9	Polish (pl) P21		14
10	German (de) CDK-Inhibitor 1		11

More...

#	Language	Value
cs	Czech P21
de	German CDK-Inhibitor 1
en	English P21
es	Spanish P21
fi	Finnish P21 (proteiini)
fr	French P21
id	Indonesian P21
it	Italian P21
ja	Japanese P21
ko	Korean P21
nl	Dutch P21 (eiwit)
pl	Polish P21
pt	Portuguese P21
ru	Russian CDKN1A
uk	Ukrainian CDKN1A

Best Rank

French: #170569 12.2017

Global: #132092 04.2015

Best Rank

French: #75765 03.2015

Global: #86427 04.2013

On 1 July 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2026 FIFA World Cup, Kylian Mbappé, Erling Haaland, Democratic Republic of the Congo, FIFA World Cup, Harry Kane, Romelu Lukaku, Senegal, Michael Olise, Sadio Mané.

In French Wikipedia the most popular articles on that day were: Michael Olise, Liste des buteurs de la Coupe du monde de football, Coupe du monde de football 2026, Kylian Mbappé, All Her Fault, Rudi Garcia, Romelu Lukaku, Coupe du monde de football, Sadio Mané, Didier Deschamps.

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 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information