21604936111 has 24 divisors (see below), whose sum is σ = 24132286080. Its totient is φ = 19323419280.

The previous prime is 21604936103. The next prime is 21604936121. The reversal of 21604936111 is 11163940612.

It is not a de Polignac number, because 21604936111 - 2³ = 21604936103 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 (21604936121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10594830 + ... + 10596868.

It is an arithmetic number, because the mean of its divisors is an integer number (1005511920).

Almost surely, 2^21604936111 is an apocalyptic number.

21604936111 is a deficient number, since it is larger than the sum of its proper divisors (2527349969).

21604936111 is a wasteful number, since it uses less digits than its factorization.

21604936111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435 (or 3424 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 21604936111 in words is "twenty-one billion, six hundred four million, nine hundred thirty-six thousand, one hundred eleven".