GCF of 21 and 22 (Greatest Common Factor)

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest Common Divisor of 21 and 22?

Answer

GCF of 21 and 22 is 1

(One)

Finding GCF for 21 and 22 using all factors (divisors) listing

The first method to find GCF for numbers 21 and 22 is to list all factors for both numbers and pick the highest common one:

All factors of 21: 1, 3, 7, 21

All factors of 22: 1, 2, 11, 22

So the Greatest Common Factor for 21 and 22 is 1

Finding GCF for 21 and 22 by Prime Factorization

The numbers 21 and 22 have no common prime factors, which means they are coprime (relatively prime). Therefore, GCF = 1.

Related Calculations

See Also

About "Greatest Common Factor" Calculator

This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Divisor of 21 and 22? (The answer is: 1). Select the first number (e.g. '21') and the second number (e.g. '22'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder.

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

GCF Table

Number 1Number 2GCF
21147
21153
21221
21243
21251
21261
21273
21287
21303
21321
21333
21357
21363
21371
21381
21393
21401
214221
21441
21453
21461
21483
21497
21501
21513
21543
21567
21603
21707
218421

FAQ

What is the Greatest Common Divisor of 21 and 22?

GCF of 21 and 22 is 1

How to find the GCF of 21 and 22?

You can find the GCF of 21 and 22 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 21 and 22 is 1.

Are 21 and 22 coprime?

Yes, 21 and 22 are coprime (relatively prime) because their Greatest Common Factor is 1.

See Also