How many divisors does 21 have?

The divisors or factors of 21 are:

1, 3 and 7

The number 21 has 3 divisors.

Divisors of Calculator

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The number 21 is a composite number because it is divisible at least by 3, and 7. See below how many and what are their divisors.

The prime factorization of the number 21 is written as the product of powers, as 3•7 .

The prime factors of 21 are 3, and 7.

Prime factors do not always represent all divisors of a number. The number 21 has the following divisors or factors:

1, 3 and 7

These numbers above represent 'all' the divisors of 21 (not only the prime ones). Note that the number 21 has 3 divisors.

Use our divisor calculator to find out if any number is divisible, and in this case, identify and count all its divisors. See also our 'Table of Divisors from 0 to 10,000'

FAQs on divisors or factors of 21

What are all the divisors of 21?

The divisors of the number 21 are:

1, 3 and 7

How many divisors does 21 have?

The number 21 has 3 divisors.

Is 21 a prime or a composite number?

The number 21 is a composite number because it is divided by 3.

See also our tables of dividers:

Divisors Calculation Examples With Work

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