18479425221 has 48 divisors (see below), whose sum is σ = 29203918848. Its totient is φ = 11209536000.

The previous prime is 18479425219. The next prime is 18479425271. The reversal of 18479425221 is 12252497481.

18479425221 is a `hidden beast` number, since 1 + 84 + 7 + 9 + 42 + 522 + 1 = 666.

It is not a de Polignac number, because 18479425221 - 2¹ = 18479425219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18479425271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9252595 + ... + 9254591.

It is an arithmetic number, because the mean of its divisors is an integer number (608414976).

Almost surely, 2^18479425221 is an apocalyptic number.

It is an amenable number.

18479425221 is a deficient number, since it is larger than the sum of its proper divisors (10724493627).

18479425221 is a wasteful number, since it uses less digits than its factorization.

18479425221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4002 (or 3999 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 18479425221 in words is "eighteen billion, four hundred seventy-nine million, four hundred twenty-five thousand, two hundred twenty-one".