12131031011 has 32 divisors (see below), whose sum is σ = 14223230976. Its totient is φ = 10240992000.

The previous prime is 12131031001. The next prime is 12131031047. The reversal of 12131031011 is 11013013121.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12131031011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12131031001) 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, 914456 + ... + 927626.

It is an arithmetic number, because the mean of its divisors is an integer number (444475968).

Almost surely, 2^12131031011 is an apocalyptic number.

12131031011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12131031011 is a deficient number, since it is larger than the sum of its proper divisors (2092199965).

12131031011 is a wasteful number, since it uses less digits than its factorization.

12131031011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13323.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 12131031011 its reverse (11013013121), we get a palindrome (23144044132).

The spelling of 12131031011 in words is "twelve billion, one hundred thirty-one million, thirty-one thousand, eleven".