What is the Greatest Common Factor of 21516 and 21531?

Greatest common factor (GCF) of 21516 and 21531 is 3.

GCF(21516,21531) = 3

We will now calculate the prime factors of 21516 and 21531, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21516 and 21531.

How to find the GCF of 21516 and 21531?

We will first find the prime factorization of 21516 and 21531. After we will calculate the factors of 21516 and 21531 and find the biggest common factor number .

Step-1: Prime Factorization of 21516

Prime factors of 21516 are 2, 3, 11, 163. Prime factorization of 21516 in exponential form is:

21516 = 2² × 3¹ × 11¹ × 163¹

Step-2: Prime Factorization of 21531

Prime factors of 21531 are 3, 7177. Prime factorization of 21531 in exponential form is:

21531 = 3¹ × 7177¹

Step-3: Factors of 21516

List of positive integer factors of 21516 that divides 21516 without a remainder.

1, 2, 3, 4, 6, 11, 12, 22, 33, 44, 66, 132, 163, 326, 489, 652, 978, 1793, 1956, 3586, 5379, 7172, 10758

Step-4: Factors of 21531

List of positive integer factors of 21531 that divides 21516 without a remainder.

1, 3, 7177

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21516 and 21531. The biggest common factor number is the GCF number.
So the greatest common factor 21516 and 21531 is 3.

Also check out the Least Common Multiple of 21516 and 21531