What is the Greatest Common Factor of 21921 and 21940?

Greatest common factor (GCF) of 21921 and 21940 is 1.

GCF(21921,21940) = 1

We will now calculate the prime factors of 21921 and 21940, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21921 and 21940.

How to find the GCF of 21921 and 21940?

We will first find the prime factorization of 21921 and 21940. After we will calculate the factors of 21921 and 21940 and find the biggest common factor number .

Step-1: Prime Factorization of 21921

Prime factors of 21921 are 3, 7307. Prime factorization of 21921 in exponential form is:

21921 = 3¹ × 7307¹

Step-2: Prime Factorization of 21940

Prime factors of 21940 are 2, 5, 1097. Prime factorization of 21940 in exponential form is:

21940 = 2² × 5¹ × 1097¹

Step-3: Factors of 21921

List of positive integer factors of 21921 that divides 21921 without a remainder.

1, 3, 7307

Step-4: Factors of 21940

List of positive integer factors of 21940 that divides 21921 without a remainder.

1, 2, 4, 5, 10, 20, 1097, 2194, 4388, 5485, 10970

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21921 and 21940. The biggest common factor number is the GCF number.
So the greatest common factor 21921 and 21940 is 1.

Also check out the Least Common Multiple of 21921 and 21940