File:Squaring_the_Square_(minimum).png · Wikimedia Commons · See Wikimedia Commons
Also known as the number 21, 1*21, 21*1, twenty-one, twenty one, ㉑
número
AI overview
21 is a whole number that comes after 20 and before 22 in the sequence of counting numbers. It is the product of multiplying 3 by 7, making it a composite number with practical applications in mathematics and everyday contexts like telling time and measuring.
AI-generated from the Wikipedia summary — may contain errors.
In the Vinony graph
Vinony's link graph records 451 inbound references to 21, and connects out to natural number, semiprime and Gregorian calendar.
It is catalogued under the topic Integers.
Vinony links it to 103 Wikipedia language editions.
Wikidata facts
- Instance of
- harshad number
- Followed by
- 22
- Follows
- 20
- Image
- Zlin skyscraper 01.jpg
Show 10 more facts
- code
- 30
- Unicode character
- ㉑
- number of decimal digits
- 2
- Commons category
- 21 (number)
- numeric value
- 21
- prime factor
- 7
- different from
- 21
- P8168
- dual wield
- name in hiero markup
- V20-V20-Z1
- maintained by WikiProject
- WikiProject Mathematics
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