What is the Greatest Common Factor of 21945 and 21949?

Greatest common factor (GCF) of 21945 and 21949 is 1.

GCF(21945,21949) = 1

We will now calculate the prime factors of 21945 and 21949, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21945 and 21949.

How to find the GCF of 21945 and 21949?

We will first find the prime factorization of 21945 and 21949. After we will calculate the factors of 21945 and 21949 and find the biggest common factor number .

Step-1: Prime Factorization of 21945

Prime factors of 21945 are 3, 5, 7, 11, 19. Prime factorization of 21945 in exponential form is:

21945 = 3¹ × 5¹ × 7¹ × 11¹ × 19¹

Step-2: Prime Factorization of 21949

Prime factors of 21949 are 47, 467. Prime factorization of 21949 in exponential form is:

21949 = 47¹ × 467¹

Step-3: Factors of 21945

List of positive integer factors of 21945 that divides 21945 without a remainder.

1, 3, 5, 7, 11, 15, 19, 21, 33, 35, 55, 57, 77, 95, 105, 133, 165, 209, 231, 285, 385, 399, 627, 665, 1045, 1155, 1463, 1995, 3135, 4389, 7315

Step-4: Factors of 21949

List of positive integer factors of 21949 that divides 21945 without a remainder.

1, 47, 467

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21945 and 21949. The biggest common factor number is the GCF number.
So the greatest common factor 21945 and 21949 is 1.

Also check out the Least Common Multiple of 21945 and 21949