12011331231 has 24 divisors (see below), whose sum is σ = 17445614160. Its totient is φ = 7963401600.

The previous prime is 12011331203. The next prime is 12011331281. The reversal of 12011331231 is 13213311021.

It is not a de Polignac number, because 12011331231 - 2¹³ = 12011323039 is a prime.

It is a super-2 number, since 2×12011331231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011331281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1363800 + ... + 1372578.

It is an arithmetic number, because the mean of its divisors is an integer number (726900590).

Almost surely, 2^12011331231 is an apocalyptic number.

12011331231 is a deficient number, since it is larger than the sum of its proper divisors (5434282929).

12011331231 is a wasteful number, since it uses less digits than its factorization.

12011331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9607 (or 9604 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 12011331231 its reverse (13213311021), we get a palindrome (25224642252).

The spelling of 12011331231 in words is "twelve billion, eleven million, three hundred thirty-one thousand, two hundred thirty-one".