18477970421 has 16 divisors (see below), whose sum is σ = 19608153600. Its totient is φ = 17363785968.

The previous prime is 18477970409. The next prime is 18477970451. The reversal of 18477970421 is 12407977481.

It is a de Polignac number, because none of the positive numbers 2^k-18477970421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18477970421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18477970451) 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, 3766256 + ... + 3771158.

It is an arithmetic number, because the mean of its divisors is an integer number (1225509600).

Almost surely, 2^18477970421 is an apocalyptic number.

It is an amenable number.

18477970421 is a deficient number, since it is larger than the sum of its proper divisors (1130183179).

18477970421 is a wasteful number, since it uses less digits than its factorization.

18477970421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6488.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 18477970421 in words is "eighteen billion, four hundred seventy-seven million, nine hundred seventy thousand, four hundred twenty-one".