12156376321 has 4 divisors (see below), whose sum is σ = 12156963412. Its totient is φ = 12155789232.

The previous prime is 12156376279. The next prime is 12156376357. The reversal of 12156376321 is 12367365121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 402564096 + 11753812225 = 20064^2 + 108415^2 .

It is a cyclic number.

It is not a de Polignac number, because 12156376321 - 2⁹ = 12156375809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12156386321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261306 + ... + 304291.

It is an arithmetic number, because the mean of its divisors is an integer number (3039240853).

Almost surely, 2^12156376321 is an apocalyptic number.

It is an amenable number.

12156376321 is a deficient number, since it is larger than the sum of its proper divisors (587091).

12156376321 is an equidigital number, since it uses as much as digits as its factorization.

12156376321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587090.

The product of its digits is 45360, while the sum is 37.

The spelling of 12156376321 in words is "twelve billion, one hundred fifty-six million, three hundred seventy-six thousand, three hundred twenty-one".