21685045059 has 16 divisors (see below), whose sum is σ = 33816835200. Its totient is φ = 13695817608.

The previous prime is 21685045051. The next prime is 21685045069. The reversal of 21685045059 is 95054058612.

It is not a de Polignac number, because 21685045059 - 2³ = 21685045051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21685045051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21135009 + ... + 21136034.

It is an arithmetic number, because the mean of its divisors is an integer number (2113552200).

Almost surely, 2^21685045059 is an apocalyptic number.

21685045059 is a deficient number, since it is larger than the sum of its proper divisors (12131790141).

21685045059 is a wasteful number, since it uses less digits than its factorization.

21685045059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42271071 (or 42271065 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 21685045059 in words is "twenty-one billion, six hundred eighty-five million, forty-five thousand, fifty-nine".