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What Are the Factors of 21?

The factors of 21 are 1, 3, 7, 21.

Here is how you calculate the factors of 21. 1 and 21 are the first two factors.


  1. Try 1. 1 x 21 = 21, so put these into our factor list.
    1...21

  2. Take 2... no good. 21/2 isn't a whole number. So we skip 2.

  3. Now take 3. 3 x 7 = 21, so now we put these in our list of factors.
    13...721

  4. Next try 4... no luck. 21/4 isn't a whole number. So we skip 4.

  5. Now try 5... nope! 21/5 isn't a whole number. So we skip 5.

  6. Now, since we don't have any more numbers to try, we're done!
    13721


Try another number:

Need help finding the factors of 21? It's easy! Here you go: the factors of 21 are 1, 3... | randytayler@gmail.com