18031208821 has 8 divisors (see below), whose sum is σ = 18472857984. Its totient is φ = 17589648480.

The previous prime is 18031208803. The next prime is 18031208837. The reversal of 18031208821 is 12880213081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18031208821 - 2¹⁷ = 18031077749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18031208891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598116 + ... + 627538.

It is an arithmetic number, because the mean of its divisors is an integer number (2309107248).

Almost surely, 2^18031208821 is an apocalyptic number.

It is an amenable number.

18031208821 is a deficient number, since it is larger than the sum of its proper divisors (441649163).

18031208821 is a wasteful number, since it uses less digits than its factorization.

18031208821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44411.

The product of its (nonzero) digits is 6144, while the sum is 34.

The spelling of 18031208821 in words is "eighteen billion, thirty-one million, two hundred eight thousand, eight hundred twenty-one".