21804111873 has 16 divisors (see below), whose sum is σ = 32304827200. Its totient is φ = 14534976960.

The previous prime is 21804111871. The next prime is 21804111907. The reversal of 21804111873 is 37811140812.

It is not a de Polignac number, because 21804111873 - 2¹ = 21804111871 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504138 + ... + 545676.

It is an arithmetic number, because the mean of its divisors is an integer number (2019051700).

Almost surely, 2^21804111873 is an apocalyptic number.

It is an amenable number.

21804111873 is a deficient number, since it is larger than the sum of its proper divisors (10500715327).

21804111873 is a wasteful number, since it uses less digits than its factorization.

21804111873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60989 (or 60983 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 21804111873 in words is "twenty-one billion, eight hundred four million, one hundred eleven thousand, eight hundred seventy-three".