What is the Greatest Common Factor of 21957 and 21971?

Greatest common factor (GCF) of 21957 and 21971 is 1.

GCF(21957,21971) = 1

We will now calculate the prime factors of 21957 and 21971, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21957 and 21971.

How to find the GCF of 21957 and 21971?

We will first find the prime factorization of 21957 and 21971. After we will calculate the factors of 21957 and 21971 and find the biggest common factor number .

Step-1: Prime Factorization of 21957

Prime factors of 21957 are 3, 13, 563. Prime factorization of 21957 in exponential form is:

21957 = 3¹ × 13¹ × 563¹

Step-2: Prime Factorization of 21971

Prime factors of 21971 are 127, 173. Prime factorization of 21971 in exponential form is:

21971 = 127¹ × 173¹

Step-3: Factors of 21957

List of positive integer factors of 21957 that divides 21957 without a remainder.

1, 3, 13, 39, 563, 1689, 7319

Step-4: Factors of 21971

List of positive integer factors of 21971 that divides 21957 without a remainder.

1, 127, 173

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21957 and 21971. The biggest common factor number is the GCF number.
So the greatest common factor 21957 and 21971 is 1.

Also check out the Least Common Multiple of 21957 and 21971