21 (number) facts for kids
This article is about the number 21. For the year, see 21.
Twenty-one is a number. It comes between twenty and twenty-two, and is an odd number. It is divisible by 1, 3, 7, and 21.
Twenty-one is also a name of a popular card game and is the age at which people in the United States can buy alcoholic drinks.
In Roman numerals, 21 is written as XXI.
Images for kids
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Building called "21" in Zlín, Czech Republic.
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Detail of the building entrance
See also
In Spanish: Veintiuno para niños
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21 (number) Facts for Kids. Kiddle Encyclopedia.