What is the Least Common Multiple of 21621 and 21639?

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 21621 and 21639 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21621 and 21639, than apply into the LCM equation.

GCF(21621,21639) = 3
LCM(21621,21639) = ( 21621 × 21639) / 3
LCM(21621,21639) = 467856819 / 3
LCM(21621,21639) = 155952273

Least Common Multiple (LCM) of 21621 and 21639 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21621 and 21639. First we will calculate the prime factors of 21621 and 21639.

Prime Factorization of 21621

Prime Factorization of 21639

Now multiplying the highest exponent prime factors to calculate the LCM of 21621 and 21639.

LCM(21621,21639) = 3¹ × 7207¹ × 7213¹
LCM(21621,21639) = 155952273