What is the Greatest Common Factor of 21665 and 21678?

Greatest common factor (GCF) of 21665 and 21678 is 1.

GCF(21665,21678) = 1

We will now calculate the prime factors of 21665 and 21678, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21665 and 21678.

How to find the GCF of 21665 and 21678?

We will first find the prime factorization of 21665 and 21678. After we will calculate the factors of 21665 and 21678 and find the biggest common factor number .

Step-1: Prime Factorization of 21665

Prime factors of 21665 are 5, 7, 619. Prime factorization of 21665 in exponential form is:

21665 = 5¹ × 7¹ × 619¹

Step-2: Prime Factorization of 21678

Prime factors of 21678 are 2, 3, 3613. Prime factorization of 21678 in exponential form is:

21678 = 2¹ × 3¹ × 3613¹

Step-3: Factors of 21665

List of positive integer factors of 21665 that divides 21665 without a remainder.

1, 5, 7, 35, 619, 3095, 4333

Step-4: Factors of 21678

List of positive integer factors of 21678 that divides 21665 without a remainder.

1, 2, 3, 6, 3613, 7226, 10839

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21665 and 21678. The biggest common factor number is the GCF number.
So the greatest common factor 21665 and 21678 is 1.

Also check out the Least Common Multiple of 21665 and 21678