121918564 has 24 divisors (see below), whose sum is σ = 218792448. Its totient is φ = 59417280.

The previous prime is 121918553. The next prime is 121918597. The reversal of 121918564 is 465819121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49752 + ... + 52144.

It is an arithmetic number, because the mean of its divisors is an integer number (9116352).

Almost surely, 2^121918564 is an apocalyptic number.

It is an amenable number.

121918564 is a deficient number, since it is larger than the sum of its proper divisors (96873884).

121918564 is a wasteful number, since it uses less digits than its factorization.

121918564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715 (or 2713 counting only the distinct ones).

The product of its digits is 17280, while the sum is 37.

The square root of 121918564 is about 11041.6739672932. The cubic root of 121918564 is about 495.8571876824.

The spelling of 121918564 in words is "one hundred twenty-one million, nine hundred eighteen thousand, five hundred sixty-four".