21318185759 has 24 divisors (see below), whose sum is σ = 24807114000. Its totient is φ = 18244182528.

The previous prime is 21318185729. The next prime is 21318185843. The reversal of 21318185759 is 95758181312.

It is not a de Polignac number, because 21318185759 - 2⁸ = 21318185503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21318185719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137117 + ... + 247865.

It is an arithmetic number, because the mean of its divisors is an integer number (1033629750).

Almost surely, 2^21318185759 is an apocalyptic number.

21318185759 is a deficient number, since it is larger than the sum of its proper divisors (3488928241).

21318185759 is a wasteful number, since it uses less digits than its factorization.

21318185759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110859 (or 110846 counting only the distinct ones).

The product of its digits is 604800, while the sum is 50.

The spelling of 21318185759 in words is "twenty-one billion, three hundred eighteen million, one hundred eighty-five thousand, seven hundred fifty-nine".