What is the Greatest Common Factor of 21864 and 21873?

Greatest common factor (GCF) of 21864 and 21873 is 3.

GCF(21864,21873) = 3

We will now calculate the prime factors of 21864 and 21873, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21864 and 21873.

How to find the GCF of 21864 and 21873?

We will first find the prime factorization of 21864 and 21873. After we will calculate the factors of 21864 and 21873 and find the biggest common factor number .

Step-1: Prime Factorization of 21864

Prime factors of 21864 are 2, 3, 911. Prime factorization of 21864 in exponential form is:

21864 = 2³ × 3¹ × 911¹

Step-2: Prime Factorization of 21873

Prime factors of 21873 are 3, 23, 317. Prime factorization of 21873 in exponential form is:

21873 = 3¹ × 23¹ × 317¹

Step-3: Factors of 21864

List of positive integer factors of 21864 that divides 21864 without a remainder.

1, 2, 3, 4, 6, 8, 12, 24, 911, 1822, 2733, 3644, 5466, 7288, 10932

Step-4: Factors of 21873

List of positive integer factors of 21873 that divides 21864 without a remainder.

1, 3, 23, 69, 317, 951, 7291

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21864 and 21873. The biggest common factor number is the GCF number.
So the greatest common factor 21864 and 21873 is 3.

Also check out the Least Common Multiple of 21864 and 21873