What Are the Factors of 21?

By Staff WriterLast Updated Mar 28, 2020 10:50:11 PM ET
factors-21
Sela Yair/CC-BY-SA 2.0

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.

Advertisement