What is the Greatest Common Factor of 21243 and 21261?

Greatest common factor (GCF) of 21243 and 21261 is 3.

GCF(21243,21261) = 3

We will now calculate the prime factors of 21243 and 21261, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21243 and 21261.

How to find the GCF of 21243 and 21261?

We will first find the prime factorization of 21243 and 21261. After we will calculate the factors of 21243 and 21261 and find the biggest common factor number .

Step-1: Prime Factorization of 21243

Prime factors of 21243 are 3, 73, 97. Prime factorization of 21243 in exponential form is:

21243 = 3¹ × 73¹ × 97¹

Step-2: Prime Factorization of 21261

Prime factors of 21261 are 3, 19, 373. Prime factorization of 21261 in exponential form is:

21261 = 3¹ × 19¹ × 373¹

Step-3: Factors of 21243

List of positive integer factors of 21243 that divides 21243 without a remainder.

1, 3, 73, 97, 219, 291, 7081

Step-4: Factors of 21261

List of positive integer factors of 21261 that divides 21243 without a remainder.

1, 3, 19, 57, 373, 1119, 7087

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21243 and 21261. The biggest common factor number is the GCF number.
So the greatest common factor 21243 and 21261 is 3.

Also check out the Least Common Multiple of 21243 and 21261