All the numbers are divisible by 1.
Factors of 21
So , 21 ÷ 1 = 21
Then divide the number by 3.
21 ÷ 3 = 7.
Then the next possible divisor is 7.
21 ÷ 7 = 3.
And then 21 ÷ 21 = 1.
Therefore the factors of 21 are 1 , 3 , 7 , 21.
That is 21 = 1 x 3 x 7.
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