21170650915 has 16 divisors (see below), whose sum is σ = 26777106720. Its totient is φ = 16023985920.

The previous prime is 21170650859. The next prime is 21170650937. The reversal of 21170650915 is 51905607112.

It is not a de Polignac number, because 21170650915 - 2²⁹ = 20633780003 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74124 + ... + 218713.

It is an arithmetic number, because the mean of its divisors is an integer number (1673569170).

Almost surely, 2^21170650915 is an apocalyptic number.

21170650915 is a deficient number, since it is larger than the sum of its proper divisors (5606455805).

21170650915 is a wasteful number, since it uses less digits than its factorization.

21170650915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293622.

The product of its (nonzero) digits is 18900, while the sum is 37.

The spelling of 21170650915 in words is "twenty-one billion, one hundred seventy million, six hundred fifty thousand, nine hundred fifteen".