121630978 has 16 divisors (see below), whose sum is σ = 212045760. Its totient is φ = 51243696.

The previous prime is 121630973. The next prime is 121630979. The reversal of 121630978 is 879036121.

It is not an unprimeable number, because it can be changed into a prime (121630973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72801 + ... + 74452.

It is an arithmetic number, because the mean of its divisors is an integer number (13252860).

Almost surely, 2^121630978 is an apocalyptic number.

121630978 is a deficient number, since it is larger than the sum of its proper divisors (90414782).

121630978 is a wasteful number, since it uses less digits than its factorization.

121630978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147321.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 121630978 is about 11028.6435249309. The cubic root of 121630978 is about 495.4669986571.

The spelling of 121630978 in words is "one hundred twenty-one million, six hundred thirty thousand, nine hundred seventy-eight".