What is the Greatest Common Factor of 21555 and 21573?

Greatest common factor (GCF) of 21555 and 21573 is 9.

GCF(21555,21573) = 9

We will now calculate the prime factors of 21555 and 21573, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21555 and 21573.

How to find the GCF of 21555 and 21573?

We will first find the prime factorization of 21555 and 21573. After we will calculate the factors of 21555 and 21573 and find the biggest common factor number .

Step-1: Prime Factorization of 21555

Prime factors of 21555 are 3, 5, 479. Prime factorization of 21555 in exponential form is:

21555 = 3² × 5¹ × 479¹

Step-2: Prime Factorization of 21573

Prime factors of 21573 are 3, 17, 47. Prime factorization of 21573 in exponential form is:

21573 = 3³ × 17¹ × 47¹

Step-3: Factors of 21555

List of positive integer factors of 21555 that divides 21555 without a remainder.

1, 3, 5, 9, 15, 45, 479, 1437, 2395, 4311, 7185

Step-4: Factors of 21573

List of positive integer factors of 21573 that divides 21555 without a remainder.

1, 3, 9, 17, 27, 47, 51, 141, 153, 423, 459, 799, 1269, 2397, 7191

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21555 and 21573. The biggest common factor number is the GCF number.
So the greatest common factor 21555 and 21573 is 9.

Also check out the Least Common Multiple of 21555 and 21573