18407306421 has 24 divisors (see below), whose sum is σ = 30655584960. Its totient is φ = 10425373056.

The previous prime is 18407306383. The next prime is 18407306429. The reversal of 18407306421 is 12460370481.

18407306421 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 7 + 3 + 0 + 642 + 1 = 666.

It is not a de Polignac number, because 18407306421 - 2⁷ = 18407306293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18407306429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1285711 + ... + 1299948.

It is an arithmetic number, because the mean of its divisors is an integer number (1277316040).

Almost surely, 2^18407306421 is an apocalyptic number.

It is an amenable number.

18407306421 is a deficient number, since it is larger than the sum of its proper divisors (12248278539).

18407306421 is a wasteful number, since it uses less digits than its factorization.

18407306421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2585785 (or 2585782 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 18407306421 in words is "eighteen billion, four hundred seven million, three hundred six thousand, four hundred twenty-one".