12179565021 has 32 divisors (see below), whose sum is σ = 18080543488. Its totient is φ = 7244121600.

The previous prime is 12179564987. The next prime is 12179565023. The reversal of 12179565021 is 12056597121.

It is not a de Polignac number, because 12179565021 - 2¹¹ = 12179562973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12179565023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189945 + ... + 245841.

It is an arithmetic number, because the mean of its divisors is an integer number (565016984).

Almost surely, 2^12179565021 is an apocalyptic number.

It is an amenable number.

12179565021 is a deficient number, since it is larger than the sum of its proper divisors (5900978467).

12179565021 is a wasteful number, since it uses less digits than its factorization.

12179565021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56101.

The product of its (nonzero) digits is 37800, while the sum is 39.

The spelling of 12179565021 in words is "twelve billion, one hundred seventy-nine million, five hundred sixty-five thousand, twenty-one".