Q: Why is 21 a good number?

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The only composite factor of 21 is 21.

-8 × (number + 21) = 96 → number + 21 = 96 ÷ -8 → number = 96 ÷ -8 - 21 = -12 - 21 = -33

21 is an odd composite number

no, 21*21=441

Who says it is? 21 is a composite number!

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It's one of the best !

The only composite factor of 21 is 21.

-8 × (number + 21) = 96 → number + 21 = 96 ÷ -8 → number = 96 ÷ -8 - 21 = -12 - 21 = -33

21

21 is an odd composite number

73 is the 21st prime number. 21 is 7*3. 73 reversed is 37. 37 is the 12th prime number (which is 21 reversed) Finally, 73 in binary is 1001001 which backwards is 1001001 (it's palindromic).

it is 7x3=21

21 is a composite number

21 is a rational number.

Who says it is? 21 is a composite number!

number 21 is prime

no, 21*21=441