# Prime factorization of 21

Here you will see step by step solution of prime factorization of 21, how to find factors of 21, you will see all factors of 21, how many factors of 21 has? Factors of 21 are 1, 3, 7, 21, we can see that 21 has 4 factor and sum of all factors is 32.

• All Factors of 21: 1, 3, 7, 21
• Prime Factors of 21: 3 × 7
• Prime Factorization of 21: 31 × 71
• Sum of Factors of 21: 32
• Is 21 prime number: No

### How to find factors of 21 by Division Method?

To find the factors of 21 by division method, we need the find the all numbers between 1 to 21, which divide 21 with 0 remainder, then the number is factor of 21.

### Pair factors of 21

• 21/1 = 21 [ 1 × 21 (1, 21) 1 and 21 is pair factor of 21]
• 21/3 = 7 [ 3 × 7 (3, 7) 3 and 7 is pair factor of 21]
• 21/7 = 3 [ 7 × 3 (7, 3) 7 and 3 is pair factor of 21]
• 21/21 = 1 [ 21 × 1 (21, 1) 21 and 1 is pair factor of 21]

As we checked numbers between 1 to 21 that are not leaving any remainder, hence we can say factors of 21 is 1, 3, 7, 21.

Also note that, in exponential form prime factorization of 21 is written as 31 × 71 and it is a composite number.

#### Prime Factorization Calculator

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