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21 (number) facts for kids

Kids Encyclopedia Facts

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.

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21 (number) Facts for Kids. Kiddle Encyclopedia.