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21021 is not a Prime number because it has more than two factors. 21021 is also divisible by 3, which can be checked by using test of divisibility:
Sum of digits of 21021 = 2+1+0+2+1 = 6(a multiple of 3)and this means that 21021 is divisible by 3.
Test of divisibility helps a lot for a number like 21021.
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