12013012331 has 4 divisors (see below), whose sum is σ = 12015443664. Its totient is φ = 12010581000.

The previous prime is 12013012321. The next prime is 12013012343. The reversal of 12013012331 is 13321031021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13321031021 = 73 ⋅182479877.

It is a cyclic number.

It is not a de Polignac number, because 12013012331 - 2⁶ = 12013012267 is a prime.

It is a super-2 number, since 2×12013012331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12013012321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1208240 + ... + 1218141.

It is an arithmetic number, because the mean of its divisors is an integer number (3003860916).

Almost surely, 2^12013012331 is an apocalyptic number.

12013012331 is a deficient number, since it is larger than the sum of its proper divisors (2431333).

12013012331 is an equidigital number, since it uses as much as digits as its factorization.

12013012331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431332.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 12013012331 its reverse (13321031021), we get a palindrome (25334043352).

The spelling of 12013012331 in words is "twelve billion, thirteen million, twelve thousand, three hundred thirty-one".