18221838364 has 12 divisors (see below), whose sum is σ = 31945470984. Its totient is φ = 9094560944.

The previous prime is 18221838311. The next prime is 18221838367. The reversal of 18221838364 is 46383812281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221838367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4087054 + ... + 4091509.

It is an arithmetic number, because the mean of its divisors is an integer number (2662122582).

Almost surely, 2^18221838364 is an apocalyptic number.

It is an amenable number.

18221838364 is a deficient number, since it is larger than the sum of its proper divisors (13723632620).

18221838364 is a wasteful number, since it uses less digits than its factorization.

18221838364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8179124 (or 8179122 counting only the distinct ones).

The product of its digits is 442368, while the sum is 46.

The spelling of 18221838364 in words is "eighteen billion, two hundred twenty-one million, eight hundred thirty-eight thousand, three hundred sixty-four".