What is the Least Common Multiple of 21428 and 21439?

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 21428 and 21439 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21428 and 21439, than apply into the LCM equation.

GCF(21428,21439) = 11
LCM(21428,21439) = ( 21428 × 21439) / 11
LCM(21428,21439) = 459394892 / 11
LCM(21428,21439) = 41763172

Least Common Multiple (LCM) of 21428 and 21439 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21428 and 21439. First we will calculate the prime factors of 21428 and 21439.

Prime Factorization of 21428

Prime Factorization of 21439

Now multiplying the highest exponent prime factors to calculate the LCM of 21428 and 21439.

LCM(21428,21439) = 2² × 11¹ × 487¹ × 1949¹
LCM(21428,21439) = 41763172