21194170085 has 16 divisors (see below), whose sum is σ = 27767722752. Its totient is φ = 15401371200.

The previous prime is 21194170037. The next prime is 21194170093. The reversal of 21194170085 is 58007149112.

It is not a de Polignac number, because 21194170085 - 2²⁸ = 20925734629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88814 + ... + 224223.

It is an arithmetic number, because the mean of its divisors is an integer number (1735482672).

Almost surely, 2^21194170085 is an apocalyptic number.

It is an amenable number.

21194170085 is a deficient number, since it is larger than the sum of its proper divisors (6573552667).

21194170085 is a wasteful number, since it uses less digits than its factorization.

21194170085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314284.

The product of its (nonzero) digits is 20160, while the sum is 38.

The spelling of 21194170085 in words is "twenty-one billion, one hundred ninety-four million, one hundred seventy thousand, eighty-five".