12021121988 has 12 divisors (see below), whose sum is σ = 21188309520. Its totient is φ = 5967319272.

The previous prime is 12021121969. The next prime is 12021121997. The reversal of 12021121988 is 88912112021.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10809806 + ... + 10810917.

It is an arithmetic number, because the mean of its divisors is an integer number (1765692460).

Almost surely, 2^12021121988 is an apocalyptic number.

It is an amenable number.

12021121988 is a deficient number, since it is larger than the sum of its proper divisors (9167187532).

12021121988 is a wasteful number, since it uses less digits than its factorization.

12021121988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21620866 (or 21620864 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The spelling of 12021121988 in words is "twelve billion, twenty-one million, one hundred twenty-one thousand, nine hundred eighty-eight".