18221110425 has 108 divisors (see below), whose sum is σ = 39622392576. Its totient is φ = 7839475200.

The previous prime is 18221110399. The next prime is 18221110451. The reversal of 18221110425 is 52401112281.

18221110425 is a `hidden beast` number, since 1 + 8 + 221 + 1 + 10 + 425 = 666.

It is an interprime number because it is at equal distance from previous prime (18221110399) and next prime (18221110451).

It is not a de Polignac number, because 18221110425 - 2⁹ = 18221109913 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 435160 + ... + 475190.

Almost surely, 2^18221110425 is an apocalyptic number.

18221110425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18221110425 is an abundant number, since it is smaller than the sum of its proper divisors (21401282151).

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

18221110425 is a wasteful number, since it uses less digits than its factorization.

18221110425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40088 (or 40063 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The spelling of 18221110425 in words is "eighteen billion, two hundred twenty-one million, one hundred ten thousand, four hundred twenty-five".