3, 7, 11 and 13
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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.
It is: 3771113 = 21021
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The factors of 233357 are: 1 233357 The prime factors are: (233357 is a prime number)
All numbers have factors. Some factors are prime numbers. These are known as prime factors. 2 and 3 are prime factors of 6. 1 and 6 are not prime factors of 6.