Was this helpful? Like us!

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

- Try 1. 1 x 21 = 21, so put these into our factor list.
1 ... 21 - Take 2... no good. 21/2 isn't a whole number. So we skip 2.
- Now take 3. 3 x 7 = 21, so now we put these in our list of factors.
1 3 ... 7 21 - Next try 4... no luck. 21/4 isn't a whole number. So we skip 4.
- Now try 5... nope! 21/5 isn't a whole number. So we skip 5.
- Now, since we don't have any more numbers to try, we're done!
1 3 7 21

...What Are the Factors of 1?

What Are the Factors of 2?

What Are the Factors of 3?

What Are the Factors of 4?

What Are the Factors of 5?

What Are the Factors of 6?

What Are the Factors of 7?

What Are the Factors of 8?

What Are the Factors of 9?

What Are the Factors of 10?

What Are the Factors of 11?

What Are the Factors of 12?

What Are the Factors of 13?

What Are the Factors of 14?

What Are the Factors of 15?

What Are the Factors of 16?

What Are the Factors of 17?

What Are the Factors of 18?

What Are the Factors of 19?

What Are the Factors of 20?

What Are the Factors of 21?

What Are the Factors of 2?

What Are the Factors of 3?

What Are the Factors of 4?

What Are the Factors of 5?

What Are the Factors of 6?

What Are the Factors of 7?

What Are the Factors of 8?

What Are the Factors of 9?

What Are the Factors of 10?

What Are the Factors of 11?

What Are the Factors of 12?

What Are the Factors of 13?

What Are the Factors of 14?

What Are the Factors of 15?

What Are the Factors of 16?

What Are the Factors of 17?

What Are the Factors of 18?

What Are the Factors of 19?

What Are the Factors of 20?

What Are the Factors of 21?

What Are the Factors of 22?

What Are the Factors of 23?

What Are the Factors of 24?

What Are the Factors of 25?

What Are the Factors of 26?

What Are the Factors of 27?

What Are the Factors of 28?

What Are the Factors of 29?

What Are the Factors of 30?

What Are the Factors of 31?

What Are the Factors of 32?

What Are the Factors of 33?

What Are the Factors of 34?

What Are the Factors of 35?

What Are the Factors of 36?

What Are the Factors of 37?

What Are the Factors of 38?

What Are the Factors of 39?

What Are the Factors of 40?

What Are the Factors of 41?

What Are the Factors of 42?

What Are the Factors of 43?

What Are the Factors of 44?

What Are the Factors of 45?

What Are the Factors of 46?

What Are the Factors of 47?

What Are the Factors of 48?

What Are the Factors of 49?

What Are the Factors of 50?

What Are the Factors of 51?...

What Are the Factors of 23?

What Are the Factors of 24?

What Are the Factors of 25?

What Are the Factors of 26?

What Are the Factors of 27?

What Are the Factors of 28?

What Are the Factors of 29?

What Are the Factors of 30?

What Are the Factors of 31?

What Are the Factors of 32?

What Are the Factors of 33?

What Are the Factors of 34?

What Are the Factors of 35?

What Are the Factors of 36?

What Are the Factors of 37?

What Are the Factors of 38?

What Are the Factors of 39?

What Are the Factors of 40?

What Are the Factors of 41?

What Are the Factors of 42?

What Are the Factors of 43?

What Are the Factors of 44?

What Are the Factors of 45?

What Are the Factors of 46?

What Are the Factors of 47?

What Are the Factors of 48?

What Are the Factors of 49?

What Are the Factors of 50?

What Are the Factors of 51?...

Try another number:

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