What is the Greatest Common Factor of 21686 and 21691?

Greatest common factor (GCF) of 21686 and 21691 is 1.

GCF(21686,21691) = 1

We will now calculate the prime factors of 21686 and 21691, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21686 and 21691.

How to find the GCF of 21686 and 21691?

We will first find the prime factorization of 21686 and 21691. After we will calculate the factors of 21686 and 21691 and find the biggest common factor number .

Step-1: Prime Factorization of 21686

Prime factors of 21686 are 2, 7, 1549. Prime factorization of 21686 in exponential form is:

21686 = 2¹ × 7¹ × 1549¹

Step-2: Prime Factorization of 21691

Prime factors of 21691 are 109, 199. Prime factorization of 21691 in exponential form is:

21691 = 109¹ × 199¹

Step-3: Factors of 21686

List of positive integer factors of 21686 that divides 21686 without a remainder.

1, 2, 7, 14, 1549, 3098, 10843

Step-4: Factors of 21691

List of positive integer factors of 21691 that divides 21686 without a remainder.

1, 109, 199

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21686 and 21691. The biggest common factor number is the GCF number.
So the greatest common factor 21686 and 21691 is 1.

Also check out the Least Common Multiple of 21686 and 21691