12131240331 has 16 divisors (see below), whose sum is σ = 18834488064. Its totient is φ = 6801341664.

The previous prime is 12131240293. The next prime is 12131240333. The reversal of 12131240331 is 13304213121.

It is not a de Polignac number, because 12131240331 - 2⁷ = 12131240203 is a prime.

It is a super-2 number, since 2×12131240331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 12131240298 and 12131240307.

It is not an unprimeable number, because it can be changed into a prime (12131240333) 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, 5448681 + ... + 5450906.

It is an arithmetic number, because the mean of its divisors is an integer number (1177155504).

Almost surely, 2^12131240331 is an apocalyptic number.

12131240331 is a deficient number, since it is larger than the sum of its proper divisors (6703247733).

12131240331 is a wasteful number, since it uses less digits than its factorization.

12131240331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10899650.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 12131240331 its reverse (13304213121), we get a palindrome (25435453452).

The spelling of 12131240331 in words is "twelve billion, one hundred thirty-one million, two hundred forty thousand, three hundred thirty-one".