The number 21 has 4 factors and is a composite number. To calculate the **factors of 21** we divide, whenever we can, among all the numbers that are less than it.

21:1=21

21:3=7

21:7=3

21:21=1

The number 21 has 4 factors and is a composite number. To calculate the **factors of 21** we divide, whenever we can, among all the numbers that are less than it.

21:1=21

21:3=7

21:7=3

21:21=1

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