What is the Greatest Common Factor of 21375 and 21381?

Greatest common factor (GCF) of 21375 and 21381 is 3.

GCF(21375,21381) = 3

We will now calculate the prime factors of 21375 and 21381, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21375 and 21381.

How to find the GCF of 21375 and 21381?

We will first find the prime factorization of 21375 and 21381. After we will calculate the factors of 21375 and 21381 and find the biggest common factor number .

Step-1: Prime Factorization of 21375

Prime factors of 21375 are 3, 5, 19. Prime factorization of 21375 in exponential form is:

21375 = 3² × 5³ × 19¹

Step-2: Prime Factorization of 21381

Prime factors of 21381 are 3, 7127. Prime factorization of 21381 in exponential form is:

21381 = 3¹ × 7127¹

Step-3: Factors of 21375

List of positive integer factors of 21375 that divides 21375 without a remainder.

1, 3, 5, 9, 15, 19, 25, 45, 57, 75, 95, 125, 171, 225, 285, 375, 475, 855, 1125, 1425, 2375, 4275, 7125

Step-4: Factors of 21381

List of positive integer factors of 21381 that divides 21375 without a remainder.

1, 3, 7127

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21375 and 21381. The biggest common factor number is the GCF number.
So the greatest common factor 21375 and 21381 is 3.

Also check out the Least Common Multiple of 21375 and 21381