18736103921 has 16 divisors (see below), whose sum is σ = 19861459200. Its totient is φ = 17643913728.

The previous prime is 18736103917. The next prime is 18736103929. The reversal of 18736103921 is 12930163781.

It is a cyclic number.

It is not a de Polignac number, because 18736103921 - 2² = 18736103917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18736103929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 886145 + ... + 907041.

It is an arithmetic number, because the mean of its divisors is an integer number (1241341200).

Almost surely, 2^18736103921 is an apocalyptic number.

It is an amenable number.

18736103921 is a deficient number, since it is larger than the sum of its proper divisors (1125355279).

18736103921 is a wasteful number, since it uses less digits than its factorization.

18736103921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21688.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 18736103921 in words is "eighteen billion, seven hundred thirty-six million, one hundred three thousand, nine hundred twenty-one".