18221441364 has 72 divisors (see below), whose sum is σ = 55736186688. Its totient is φ = 4899882240.

The previous prime is 18221441341. The next prime is 18221441369. The reversal of 18221441364 is 46314412281.

18221441364 is a `hidden beast` number, since 1 + 82 + 214 + 4 + 1 + 364 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221441369) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2122402 + ... + 2130969.

It is an arithmetic number, because the mean of its divisors is an integer number (774113704).

Almost surely, 2^18221441364 is an apocalyptic number.

18221441364 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18221441364 is an abundant number, since it is smaller than the sum of its proper divisors (37514745324).

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

18221441364 is a wasteful number, since it uses less digits than its factorization.

18221441364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4253405 (or 4253400 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The spelling of 18221441364 in words is "eighteen billion, two hundred twenty-one million, four hundred forty-one thousand, three hundred sixty-four".