## # Factors of 21 (More Math Tools) Factors of 21 Number Factors: 1, 3, 7, 21 Factors of 21 in Pairs: (1 x 21) (3 x 7) (7 x 3) (21 x 1) Prime Factors of 21 : 3 * 7

### List of the Factors of 21

This list was generated by our Factor Calculator. It provides a list of the factors of 21 - eg, the definitive answer to 21. This could also be described as the divisors of 21.

### What are the factors of 21?

These are the integers which can be evenly divided into 21; they can be expressed as either individual factors or as factor pairs. In this case, we present them both ways.

### What is the prime factorization of 21?

A prime factorization is the result of factoring a number into a set of components which are all prime numbers. This is generally written by showing 21 as a product of its prime factors. For 21, this result would be:

21 = 3 x 7

### Is 21 a composite number?

Yes! 21 is a composite number. It is the product of two positive numbers other than 1 and itself.

### Is 21 a square number?

No! 21 is not a square number. The square root of this number (4.58) is not an integer.

### How many factors does 21 have?

This number has 4 factors: 1, 3, 7, 21

More specifically, shown as pairs...

(1*21) (3*7) (7*3) (21*1)

### Factors of Other Numbers

#### Next Several Numbers

content: factors of 21