What is the Greatest Common Factor of 55209 and 55221?

Greatest common factor (GCF) of 55209 and 55221 is 3.

GCF(55209,55221) = 3

We will now calculate the prime factors of 55209 and 55221, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 55209 and 55221.

How to find the GCF of 55209 and 55221?

We will first find the prime factorization of 55209 and 55221. After we will calculate the factors of 55209 and 55221 and find the biggest common factor number .

Step-1: Prime Factorization of 55209

Prime factors of 55209 are 3, 7, 11, 239. Prime factorization of 55209 in exponential form is:

55209 = 3¹ × 7¹ × 11¹ × 239¹

Step-2: Prime Factorization of 55221

Prime factors of 55221 are 3, 79, 233. Prime factorization of 55221 in exponential form is:

55221 = 3¹ × 79¹ × 233¹

Step-3: Factors of 55209

List of positive integer factors of 55209 that divides 55209 without a remainder.

1, 3, 7, 11, 21, 33, 77, 231, 239, 717, 1673, 2629, 5019, 7887, 18403

Step-4: Factors of 55221

List of positive integer factors of 55221 that divides 55209 without a remainder.

1, 3, 79, 233, 237, 699, 18407

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 55209 and 55221. The biggest common factor number is the GCF number.
So the greatest common factor 55209 and 55221 is 3.

Also check out the Least Common Multiple of 55209 and 55221