What is the Greatest Common Factor of 21861 and 21871?

Greatest common factor (GCF) of 21861 and 21871 is 1.

GCF(21861,21871) = 1

We will now calculate the prime factors of 21861 and 21871, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21861 and 21871.

How to find the GCF of 21861 and 21871?

We will first find the prime factorization of 21861 and 21871. After we will calculate the factors of 21861 and 21871 and find the biggest common factor number .

Step-1: Prime Factorization of 21861

Prime factors of 21861 are 3, 7, 347. Prime factorization of 21861 in exponential form is:

21861 = 3² × 7¹ × 347¹

Step-2: Prime Factorization of 21871

Prime factors of 21871 are 21871. Prime factorization of 21871 in exponential form is:

21871 = 21871¹

Step-3: Factors of 21861

List of positive integer factors of 21861 that divides 21861 without a remainder.

1, 3, 7, 9, 21, 63, 347, 1041, 2429, 3123, 7287

Step-4: Factors of 21871

List of positive integer factors of 21871 that divides 21861 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21861 and 21871. The biggest common factor number is the GCF number.
So the greatest common factor 21861 and 21871 is 1.

Also check out the Least Common Multiple of 21861 and 21871