12131240256 has 84 divisors (see below), whose sum is σ = 36817451892. Its totient is φ = 3805876224.

The previous prime is 12131240227. The next prime is 12131240257. The reversal of 12131240256 is 65204213121.

It can be written as a sum of positive squares in 2 ways, for example, as 4419590400 + 7711649856 = 66480^2 + 87816^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131240257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 609655 + ... + 629238.

Almost surely, 2^12131240256 is an apocalyptic number.

12131240256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12131240256 is an abundant number, since it is smaller than the sum of its proper divisors (24686211636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12131240256 is a wasteful number, since it uses less digits than its factorization.

12131240256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238928 (or 1238915 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 12131240256 its reverse (65204213121), we get a palindrome (77335453377).

The spelling of 12131240256 in words is "twelve billion, one hundred thirty-one million, two hundred forty thousand, two hundred fifty-six".