What is the Greatest Common Factor of 21845 and 21858?

Greatest common factor (GCF) of 21845 and 21858 is 1.

GCF(21845,21858) = 1

We will now calculate the prime factors of 21845 and 21858, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21845 and 21858.

How to find the GCF of 21845 and 21858?

We will first find the prime factorization of 21845 and 21858. After we will calculate the factors of 21845 and 21858 and find the biggest common factor number .

Step-1: Prime Factorization of 21845

Prime factors of 21845 are 5, 17, 257. Prime factorization of 21845 in exponential form is:

21845 = 5¹ × 17¹ × 257¹

Step-2: Prime Factorization of 21858

Prime factors of 21858 are 2, 3, 3643. Prime factorization of 21858 in exponential form is:

21858 = 2¹ × 3¹ × 3643¹

Step-3: Factors of 21845

List of positive integer factors of 21845 that divides 21845 without a remainder.

1, 5, 17, 85, 257, 1285, 4369

Step-4: Factors of 21858

List of positive integer factors of 21858 that divides 21845 without a remainder.

1, 2, 3, 6, 3643, 7286, 10929

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21845 and 21858. The biggest common factor number is the GCF number.
So the greatest common factor 21845 and 21858 is 1.

Also check out the Least Common Multiple of 21845 and 21858