What is the Greatest Common Factor of 21390 and 21395?

Greatest common factor (GCF) of 21390 and 21395 is 5.

GCF(21390,21395) = 5

We will now calculate the prime factors of 21390 and 21395, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21390 and 21395.

How to find the GCF of 21390 and 21395?

We will first find the prime factorization of 21390 and 21395. After we will calculate the factors of 21390 and 21395 and find the biggest common factor number .

Step-1: Prime Factorization of 21390

Prime factors of 21390 are 2, 3, 5, 23, 31. Prime factorization of 21390 in exponential form is:

21390 = 2¹ × 3¹ × 5¹ × 23¹ × 31¹

Step-2: Prime Factorization of 21395

Prime factors of 21395 are 5, 11, 389. Prime factorization of 21395 in exponential form is:

21395 = 5¹ × 11¹ × 389¹

Step-3: Factors of 21390

List of positive integer factors of 21390 that divides 21390 without a remainder.

1, 2, 3, 5, 6, 10, 15, 23, 30, 31, 46, 62, 69, 93, 115, 138, 155, 186, 230, 310, 345, 465, 690, 713, 930, 1426, 2139, 3565, 4278, 7130, 10695

Step-4: Factors of 21395

List of positive integer factors of 21395 that divides 21390 without a remainder.

1, 5, 11, 55, 389, 1945, 4279

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21390 and 21395. The biggest common factor number is the GCF number.
So the greatest common factor 21390 and 21395 is 5.

Also check out the Least Common Multiple of 21390 and 21395