121154978 has 16 divisors (see below), whose sum is σ = 208775040. Its totient is φ = 51653376.

The previous prime is 121154933. The next prime is 121154987. The reversal of 121154978 is 879451121.

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, 19718 + ... + 25121.

It is an arithmetic number, because the mean of its divisors is an integer number (13048440).

Almost surely, 2^121154978 is an apocalyptic number.

121154978 is a deficient number, since it is larger than the sum of its proper divisors (87620062).

121154978 is a wasteful number, since it uses less digits than its factorization.

121154978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45041.

The product of its digits is 20160, while the sum is 38.

The square root of 121154978 is about 11007.0422003370. The cubic root of 121154978 is about 494.8198208292.

The spelling of 121154978 in words is "one hundred twenty-one million, one hundred fifty-four thousand, nine hundred seventy-eight".