12031123331 has 4 divisors (see below), whose sum is σ = 12258125712. Its totient is φ = 11804120952.

The previous prime is 12031123297. The next prime is 12031123373. The reversal of 12031123331 is 13332113021.

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

It is a cyclic number.

It is not a de Polignac number, because 12031123331 - 2⁶ = 12031123267 is a prime.

It is a super-2 number, since 2×12031123331² (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 (12031123231) 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, 113501111 + ... + 113501216.

It is an arithmetic number, because the mean of its divisors is an integer number (3064531428).

Almost surely, 2^12031123331 is an apocalyptic number.

12031123331 is a deficient number, since it is larger than the sum of its proper divisors (227002381).

12031123331 is an equidigital number, since it uses as much as digits as its factorization.

12031123331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227002380.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 12031123331 its reverse (13332113021), we get a palindrome (25363236352).

The spelling of 12031123331 in words is "twelve billion, thirty-one million, one hundred twenty-three thousand, three hundred thirty-one".