What is the Least Common Multiple of 21987 and 22001?

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 21987 and 22001 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21987 and 22001, than apply into the LCM equation.

GCF(21987,22001) = 7
LCM(21987,22001) = ( 21987 × 22001) / 7
LCM(21987,22001) = 483735987 / 7
LCM(21987,22001) = 69105141

Least Common Multiple (LCM) of 21987 and 22001 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21987 and 22001. First we will calculate the prime factors of 21987 and 22001.

Prime Factorization of 21987

Prime Factorization of 22001

Now multiplying the highest exponent prime factors to calculate the LCM of 21987 and 22001.

LCM(21987,22001) = 3² × 7² × 349¹ × 449¹
LCM(21987,22001) = 69105141