121218538 has 16 divisors (see below), whose sum is σ = 207944640. Its totient is φ = 51915456.

The previous prime is 121218523. The next prime is 121218557. The reversal of 121218538 is 835812121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37698 + ... + 40786.

It is an arithmetic number, because the mean of its divisors is an integer number (12996540).

Almost surely, 2^121218538 is an apocalyptic number.

121218538 is a deficient number, since it is larger than the sum of its proper divisors (86726102).

121218538 is a wasteful number, since it uses less digits than its factorization.

121218538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5901.

The product of its digits is 3840, while the sum is 31.

The square root of 121218538 is about 11009.9290642583. The cubic root of 121218538 is about 494.9063360514.

The spelling of 121218538 in words is "one hundred twenty-one million, two hundred eighteen thousand, five hundred thirty-eight".