What is the Greatest Common Factor of 21228 and 21236?

Greatest common factor (GCF) of 21228 and 21236 is 4.

GCF(21228,21236) = 4

We will now calculate the prime factors of 21228 and 21236, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21228 and 21236.

How to find the GCF of 21228 and 21236?

We will first find the prime factorization of 21228 and 21236. After we will calculate the factors of 21228 and 21236 and find the biggest common factor number .

Step-1: Prime Factorization of 21228

Prime factors of 21228 are 2, 3, 29, 61. Prime factorization of 21228 in exponential form is:

21228 = 2² × 3¹ × 29¹ × 61¹

Step-2: Prime Factorization of 21236

Prime factors of 21236 are 2, 5309. Prime factorization of 21236 in exponential form is:

21236 = 2² × 5309¹

Step-3: Factors of 21228

List of positive integer factors of 21228 that divides 21228 without a remainder.

1, 2, 3, 4, 6, 12, 29, 58, 61, 87, 116, 122, 174, 183, 244, 348, 366, 732, 1769, 3538, 5307, 7076, 10614

Step-4: Factors of 21236

List of positive integer factors of 21236 that divides 21228 without a remainder.

1, 2, 4, 5309, 10618

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21228 and 21236. The biggest common factor number is the GCF number.
So the greatest common factor 21228 and 21236 is 4.

Also check out the Least Common Multiple of 21228 and 21236