What is the Least Common Multiple of 21408 and 21424?

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 21408 and 21424 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21408 and 21424, than apply into the LCM equation.

GCF(21408,21424) = 16
LCM(21408,21424) = ( 21408 × 21424) / 16
LCM(21408,21424) = 458644992 / 16
LCM(21408,21424) = 28665312

Least Common Multiple (LCM) of 21408 and 21424 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21408 and 21424. First we will calculate the prime factors of 21408 and 21424.

Prime Factorization of 21408

Prime Factorization of 21424

Now multiplying the highest exponent prime factors to calculate the LCM of 21408 and 21424.

LCM(21408,21424) = 2⁵ × 3¹ × 223¹ × 13¹ × 103¹
LCM(21408,21424) = 28665312