What is the Greatest Common Factor of 21708 and 21717?

Greatest common factor (GCF) of 21708 and 21717 is 9.

GCF(21708,21717) = 9

We will now calculate the prime factors of 21708 and 21717, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21708 and 21717.

How to find the GCF of 21708 and 21717?

We will first find the prime factorization of 21708 and 21717. After we will calculate the factors of 21708 and 21717 and find the biggest common factor number .

Step-1: Prime Factorization of 21708

Prime factors of 21708 are 2, 3, 67. Prime factorization of 21708 in exponential form is:

21708 = 2² × 3⁴ × 67¹

Step-2: Prime Factorization of 21717

Prime factors of 21717 are 3, 19, 127. Prime factorization of 21717 in exponential form is:

21717 = 3² × 19¹ × 127¹

Step-3: Factors of 21708

List of positive integer factors of 21708 that divides 21708 without a remainder.

1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 67, 81, 108, 134, 162, 201, 268, 324, 402, 603, 804, 1206, 1809, 2412, 3618, 5427, 7236, 10854

Step-4: Factors of 21717

List of positive integer factors of 21717 that divides 21708 without a remainder.

1, 3, 9, 19, 57, 127, 171, 381, 1143, 2413, 7239

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21708 and 21717. The biggest common factor number is the GCF number.
So the greatest common factor 21708 and 21717 is 9.

Also check out the Least Common Multiple of 21708 and 21717