18912111232 has 32 divisors (see below), whose sum is σ = 43058826720. Its totient is φ = 8105190144.

The previous prime is 18912111209. The next prime is 18912111233. The reversal of 18912111232 is 23211121981.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 18912111194 and 18912111203.

It is not an unprimeable number, because it can be changed into a prime (18912111233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10552738 + ... + 10554529.

It is an arithmetic number, because the mean of its divisors is an integer number (1345588335).

Almost surely, 2^18912111232 is an apocalyptic number.

It is an amenable number.

18912111232 is an abundant number, since it is smaller than the sum of its proper divisors (24146715488).

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

18912111232 is an equidigital number, since it uses as much as digits as its factorization.

18912111232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21107288 (or 21107276 counting only the distinct ones).

The product of its digits is 1728, while the sum is 31.

The spelling of 18912111232 in words is "eighteen billion, nine hundred twelve million, one hundred eleven thousand, two hundred thirty-two".