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21 is not divisible by 2 nor 5, but it is divisible by 3.

To be divisible by 2 the last digit must be even (one of {0, 2, 4, 6, 8}; the last digit 1 is not one of these, thus 21 is not divisible by 2

To be divisible by 3 sum the digits and if this total is divisible by 3, then so is the original number; the test can be repeated on the sum, so by repeatedly summing the digits of the totals until a single digit remains only if that single digit is 3, 6 or 9 is the original number divisible by 3. 21 → 2 + 1 = 3 which is divisible by 3 so 21 is divisible by 3.

To be divisible by 5, the last digit must be 0 or 5. The last digit of 21 is 1 which is not 0 nor 5, thus 21 is not divisible by 5.

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โˆ™ 2015-08-14 10:18:45
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โˆ™ 2015-08-12 08:34:25

No, it is not divisible by 23 (which is bigger), nor 5.

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Q: Is 21 divisible by 2 3 or 5?
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