18221396892 has 24 divisors (see below), whose sum is σ = 45017569296. Its totient is φ = 5716516608.

The previous prime is 18221396867. The next prime is 18221396939. The reversal of 18221396892 is 29869312281.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44660083 + ... + 44660490.

It is an arithmetic number, because the mean of its divisors is an integer number (1875732054).

Almost surely, 2^18221396892 is an apocalyptic number.

18221396892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18221396892 is an abundant number, since it is smaller than the sum of its proper divisors (26796172404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18221396892 is a wasteful number, since it uses less digits than its factorization.

18221396892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89320597 (or 89320595 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The spelling of 18221396892 in words is "eighteen billion, two hundred twenty-one million, three hundred ninety-six thousand, eight hundred ninety-two".