What is the Greatest Common Factor of 21561 and 21578?

Greatest common factor (GCF) of 21561 and 21578 is 1.

GCF(21561,21578) = 1

We will now calculate the prime factors of 21561 and 21578, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21561 and 21578.

How to find the GCF of 21561 and 21578?

We will first find the prime factorization of 21561 and 21578. After we will calculate the factors of 21561 and 21578 and find the biggest common factor number .

Step-1: Prime Factorization of 21561

Prime factors of 21561 are 3, 7187. Prime factorization of 21561 in exponential form is:

21561 = 3¹ × 7187¹

Step-2: Prime Factorization of 21578

Prime factors of 21578 are 2, 10789. Prime factorization of 21578 in exponential form is:

21578 = 2¹ × 10789¹

Step-3: Factors of 21561

List of positive integer factors of 21561 that divides 21561 without a remainder.

1, 3, 7187

Step-4: Factors of 21578

List of positive integer factors of 21578 that divides 21561 without a remainder.

1, 2, 10789

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21561 and 21578. The biggest common factor number is the GCF number.
So the greatest common factor 21561 and 21578 is 1.

Also check out the Least Common Multiple of 21561 and 21578