21604738111 has 16 divisors (see below), whose sum is σ = 23675431680. Its totient is φ = 19552012480.

The previous prime is 21604738087. The next prime is 21604738171. The reversal of 21604738111 is 11183740612.

It is not a de Polignac number, because 21604738111 - 2⁵ = 21604738079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21604738171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2432100 + ... + 2440966.

It is an arithmetic number, because the mean of its divisors is an integer number (1479714480).

Almost surely, 2^21604738111 is an apocalyptic number.

21604738111 is a deficient number, since it is larger than the sum of its proper divisors (2070693569).

21604738111 is a wasteful number, since it uses less digits than its factorization.

21604738111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 21604738111 in words is "twenty-one billion, six hundred four million, seven hundred thirty-eight thousand, one hundred eleven".