What is the Greatest Common Factor of 21159 and 21165?

Greatest common factor (GCF) of 21159 and 21165 is 3.

GCF(21159,21165) = 3

We will now calculate the prime factors of 21159 and 21165, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21159 and 21165.

How to find the GCF of 21159 and 21165?

We will first find the prime factorization of 21159 and 21165. After we will calculate the factors of 21159 and 21165 and find the biggest common factor number .

Step-1: Prime Factorization of 21159

Prime factors of 21159 are 3, 2351. Prime factorization of 21159 in exponential form is:

21159 = 3² × 2351¹

Step-2: Prime Factorization of 21165

Prime factors of 21165 are 3, 5, 17, 83. Prime factorization of 21165 in exponential form is:

21165 = 3¹ × 5¹ × 17¹ × 83¹

Step-3: Factors of 21159

List of positive integer factors of 21159 that divides 21159 without a remainder.

1, 3, 9, 2351, 7053

Step-4: Factors of 21165

List of positive integer factors of 21165 that divides 21159 without a remainder.

1, 3, 5, 15, 17, 51, 83, 85, 249, 255, 415, 1245, 1411, 4233, 7055

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21159 and 21165. The biggest common factor number is the GCF number.
So the greatest common factor 21159 and 21165 is 3.

Also check out the Least Common Multiple of 21159 and 21165