21804111875 has 60 divisors (see below), whose sum is σ = 34133498784. Its totient is φ = 13801032000.

The previous prime is 21804111871. The next prime is 21804111907. The reversal of 21804111875 is 57811140812.

It is a happy number.

It is not a de Polignac number, because 21804111875 - 2² = 21804111871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21804111871) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 370742 + ... + 425508.

Almost surely, 2^21804111875 is an apocalyptic number.

21804111875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21804111875 is a deficient number, since it is larger than the sum of its proper divisors (12329386909).

21804111875 is an equidigital number, since it uses as much as digits as its factorization.

21804111875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54814 (or 54792 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 38.

The spelling of 21804111875 in words is "twenty-one billion, eight hundred four million, one hundred eleven thousand, eight hundred seventy-five".