18464922210921 has 16 divisors (see below), whose sum is σ = 25731423782400. Its totient is φ = 11762936575488.

The previous prime is 18464922210913. The next prime is 18464922210953. The reversal of 18464922210921 is 12901222946481.

It is a happy number.

It is not a de Polignac number, because 18464922210921 - 2³ = 18464922210913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18464922210521) 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, 1094014681 + ... + 1094031558.

It is an arithmetic number, because the mean of its divisors is an integer number (1608213986400).

Almost surely, 2^{18464922210921} is an apocalyptic number.

It is an amenable number.

18464922210921 is a deficient number, since it is larger than the sum of its proper divisors (7266501571479).

18464922210921 is a wasteful number, since it uses less digits than its factorization.

18464922210921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188046368.

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 18464922210921 in words is "eighteen trillion, four hundred sixty-four billion, nine hundred twenty-two million, two hundred ten thousand, nine hundred twenty-one".