18464415021 has 96 divisors (see below), whose sum is σ = 30889098240. Its totient is φ = 10945497600.

The previous prime is 18464414951. The next prime is 18464415029. The reversal of 18464415021 is 12051446481.

18464415021 is a `hidden beast` number, since 1 + 8 + 4 + 644 + 1 + 5 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 18464415021 - 2⁷ = 18464414893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18464415029) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 40052731 + ... + 40053191.

It is an arithmetic number, because the mean of its divisors is an integer number (321761440).

Almost surely, 2^18464415021 is an apocalyptic number.

It is an amenable number.

18464415021 is a deficient number, since it is larger than the sum of its proper divisors (12424683219).

18464415021 is a wasteful number, since it uses less digits than its factorization.

18464415021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The spelling of 18464415021 in words is "eighteen billion, four hundred sixty-four million, four hundred fifteen thousand, twenty-one".