What is the Least Common Multiple of 2121 and 2128?

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 2121 and 2128 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 2121 and 2128, than apply into the LCM equation.

GCF(2121,2128) = 7
LCM(2121,2128) = ( 2121 × 2128) / 7
LCM(2121,2128) = 4513488 / 7
LCM(2121,2128) = 644784

Least Common Multiple (LCM) of 2121 and 2128 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 2121 and 2128. First we will calculate the prime factors of 2121 and 2128.

Prime Factorization of 2121

Prime Factorization of 2128

Now multiplying the highest exponent prime factors to calculate the LCM of 2121 and 2128.

LCM(2121,2128) = 3¹ × 7¹ × 101¹ × 2⁴ × 19¹
LCM(2121,2128) = 644784