21170732311 has 16 divisors (see below), whose sum is σ = 22984565760. Its totient is φ = 19435312800.

The previous prime is 21170732291. The next prime is 21170732321. The reversal of 21170732311 is 11323707112.

It is not a de Polignac number, because 21170732311 - 2¹⁷ = 21170601239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21170732311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170732321) 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, 27171 + ... + 207556.

It is an arithmetic number, because the mean of its divisors is an integer number (1436535360).

Almost surely, 2^21170732311 is an apocalyptic number.

21170732311 is a deficient number, since it is larger than the sum of its proper divisors (1813833449).

21170732311 is a wasteful number, since it uses less digits than its factorization.

21170732311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234894.

The product of its (nonzero) digits is 1764, while the sum is 28.

The spelling of 21170732311 in words is "twenty-one billion, one hundred seventy million, seven hundred thirty-two thousand, three hundred eleven".