Credit:Sela YairCC-BY-SA 2.0
Q:

# What are the factors of 21?

A:

The factors of 21 are 1, 3, 7 and 21. A factor is a number that can divide evenly into a given number. Because 21 can be divided by numbers other than itself and 1, it is called a composite number.

Know More

## Keep Learning

Every number has 1 and itself as a factor. Numbers that have no other factors are called prime numbers. To determine if 21 has other factors, a person would look to see if it is an even number. Because 21 is not, it cannot be divided by 2. Therefore, the individual would start by dividing by 3. The result is 7, which makes 3 and 7 both factors of 21. Next, 4, 5, and 6 would be tried. None of those can divide evenly into 21, so they are not factors.

Sources:

## Related Questions

• A:

The prime factors of 56 are 2 x 2 x 2 x 7. Prime factors of an original number are prime numbers that — when multiplied together — give back the original number. Finding the prime factors of a number is called prime factorization.

Filed Under:
• A:

The factors of a number are all the integers that can be multiplied together to produce that number. For example, 1, 2, 3 and 6 are all factors of 6. Multiples are all the numbers of which a given number is a factor.

Filed Under:
• A:

A linear factor is the return on an asset in relation to a limited number of factors. A linear factor is mostly written in the form of a linear equation for simplicity.