121879991584 has 48 divisors (see below), whose sum is σ = 262265931648. Its totient is φ = 55412704512.

The previous prime is 121879991551. The next prime is 121879991591. The reversal of 121879991584 is 485199978121.

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, 2158552 + ... + 2214295.

It is an arithmetic number, because the mean of its divisors is an integer number (5463873576).

Almost surely, 2^121879991584 is an apocalyptic number.

It is an amenable number.

121879991584 is an abundant number, since it is smaller than the sum of its proper divisors (140385940064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121879991584 is a wasteful number, since it uses less digits than its factorization.

121879991584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372937 (or 4372929 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 64.

The spelling of 121879991584 in words is "one hundred twenty-one billion, eight hundred seventy-nine million, nine hundred ninety-one thousand, five hundred eighty-four".