What is the Greatest Common Factor of 21355 and 21369?

Greatest common factor (GCF) of 21355 and 21369 is 1.

GCF(21355,21369) = 1

We will now calculate the prime factors of 21355 and 21369, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21355 and 21369.

How to find the GCF of 21355 and 21369?

We will first find the prime factorization of 21355 and 21369. After we will calculate the factors of 21355 and 21369 and find the biggest common factor number .

Step-1: Prime Factorization of 21355

Prime factors of 21355 are 5, 4271. Prime factorization of 21355 in exponential form is:

21355 = 5¹ × 4271¹

Step-2: Prime Factorization of 21369

Prime factors of 21369 are 3, 17, 419. Prime factorization of 21369 in exponential form is:

21369 = 3¹ × 17¹ × 419¹

Step-3: Factors of 21355

List of positive integer factors of 21355 that divides 21355 without a remainder.

1, 5, 4271

Step-4: Factors of 21369

List of positive integer factors of 21369 that divides 21355 without a remainder.

1, 3, 17, 51, 419, 1257, 7123

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21355 and 21369. The biggest common factor number is the GCF number.
So the greatest common factor 21355 and 21369 is 1.

Also check out the Least Common Multiple of 21355 and 21369