Prime Factors of 21

21 is divisible by the prime number 3 which results in 7. The result 7 cannot be divided any further as it is a prime number. Hence the prime factors of 21 are 3, 7.

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Prime Factors of 21

3, 7

Prime Factor Tree of 21

	21
3		7

• ⇐ Prime Factors of 20
• Prime Factors of 22 ⇒

Square Root of 21 Cube Root of 21

21 is divisible by the prime number 3 which results in 7. The result 7 cannot be divided any further as it is a prime number. Hence the prime factors of 21 are 3, 7.