What is the Greatest Common Factor of 21351 and 21357?

Greatest common factor (GCF) of 21351 and 21357 is 3.

GCF(21351,21357) = 3

We will now calculate the prime factors of 21351 and 21357, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21351 and 21357.

How to find the GCF of 21351 and 21357?

We will first find the prime factorization of 21351 and 21357. After we will calculate the factors of 21351 and 21357 and find the biggest common factor number .

Step-1: Prime Factorization of 21351

Prime factors of 21351 are 3, 11, 647. Prime factorization of 21351 in exponential form is:

21351 = 3¹ × 11¹ × 647¹

Step-2: Prime Factorization of 21357

Prime factors of 21357 are 3, 7, 113. Prime factorization of 21357 in exponential form is:

21357 = 3³ × 7¹ × 113¹

Step-3: Factors of 21351

List of positive integer factors of 21351 that divides 21351 without a remainder.

1, 3, 11, 33, 647, 1941, 7117

Step-4: Factors of 21357

List of positive integer factors of 21357 that divides 21351 without a remainder.

1, 3, 7, 9, 21, 27, 63, 113, 189, 339, 791, 1017, 2373, 3051, 7119

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21351 and 21357. The biggest common factor number is the GCF number.
So the greatest common factor 21351 and 21357 is 3.

Also check out the Least Common Multiple of 21351 and 21357