What is the Greatest Common Factor of 21791 and 21808?

Greatest common factor (GCF) of 21791 and 21808 is 1.

GCF(21791,21808) = 1

We will now calculate the prime factors of 21791 and 21808, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21791 and 21808.

How to find the GCF of 21791 and 21808?

We will first find the prime factorization of 21791 and 21808. After we will calculate the factors of 21791 and 21808 and find the biggest common factor number .

Step-1: Prime Factorization of 21791

Prime factors of 21791 are 7, 11, 283. Prime factorization of 21791 in exponential form is:

21791 = 7¹ × 11¹ × 283¹

Step-2: Prime Factorization of 21808

Prime factors of 21808 are 2, 29, 47. Prime factorization of 21808 in exponential form is:

21808 = 2⁴ × 29¹ × 47¹

Step-3: Factors of 21791

List of positive integer factors of 21791 that divides 21791 without a remainder.

1, 7, 11, 77, 283, 1981, 3113

Step-4: Factors of 21808

List of positive integer factors of 21808 that divides 21791 without a remainder.

1, 2, 4, 8, 16, 29, 47, 58, 94, 116, 188, 232, 376, 464, 752, 1363, 2726, 5452, 10904

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21791 and 21808. The biggest common factor number is the GCF number.
So the greatest common factor 21791 and 21808 is 1.

Also check out the Least Common Multiple of 21791 and 21808