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21 is a composite number, which means that is can be divided by numbers other than 1 and 21 into another whole number. It can be divided by 3 and 7. The best (not highest) number of points in a game of Blackjack is 21. We are now living in the 21st century. In roman numerals, 21 = XXI, where X is ten and I is 1.

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Q: What are facts about 21?
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