What is the Greatest Common Factor of 21100 and 21108?

Greatest common factor (GCF) of 21100 and 21108 is 4.

GCF(21100,21108) = 4

We will now calculate the prime factors of 21100 and 21108, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21100 and 21108.

How to find the GCF of 21100 and 21108?

We will first find the prime factorization of 21100 and 21108. After we will calculate the factors of 21100 and 21108 and find the biggest common factor number .

Step-1: Prime Factorization of 21100

Prime factors of 21100 are 2, 5, 211. Prime factorization of 21100 in exponential form is:

21100 = 2² × 5² × 211¹

Step-2: Prime Factorization of 21108

Prime factors of 21108 are 2, 3, 1759. Prime factorization of 21108 in exponential form is:

21108 = 2² × 3¹ × 1759¹

Step-3: Factors of 21100

List of positive integer factors of 21100 that divides 21100 without a remainder.

1, 2, 4, 5, 10, 20, 25, 50, 100, 211, 422, 844, 1055, 2110, 4220, 5275, 10550

Step-4: Factors of 21108

List of positive integer factors of 21108 that divides 21100 without a remainder.

1, 2, 3, 4, 6, 12, 1759, 3518, 5277, 7036, 10554

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21100 and 21108. The biggest common factor number is the GCF number.
So the greatest common factor 21100 and 21108 is 4.

Also check out the Least Common Multiple of 21100 and 21108