What is the Least Common Multiple of 21155 and 21168?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 21155 and 21168 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21155 and 21168, than apply into the LCM equation.

GCF(21155,21168) = 1
LCM(21155,21168) = ( 21155 × 21168) / 1
LCM(21155,21168) = 447809040 / 1
LCM(21155,21168) = 447809040

Least Common Multiple (LCM) of 21155 and 21168 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21155 and 21168. First we will calculate the prime factors of 21155 and 21168.

Prime Factorization of 21155

Prime Factorization of 21168

Now multiplying the highest exponent prime factors to calculate the LCM of 21155 and 21168.

LCM(21155,21168) = 5¹ × 4231¹ × 2⁴ × 3³ × 7²
LCM(21155,21168) = 447809040