12011312331 has 24 divisors (see below), whose sum is σ = 17827025424. Its totient is φ = 7787430720.

The previous prime is 12011312329. The next prime is 12011312353. The reversal of 12011312331 is 13321311021.

12011312331 is a `hidden beast` number, since 1 + 20 + 1 + 1 + 312 + 331 = 666.

It is not a de Polignac number, because 12011312331 - 2¹ = 12011312329 is a prime.

It is a super-2 number, since 2×12011312331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12011312321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 814201 + ... + 828821.

It is an arithmetic number, because the mean of its divisors is an integer number (742792726).

Almost surely, 2^12011312331 is an apocalyptic number.

12011312331 is a deficient number, since it is larger than the sum of its proper divisors (5815713093).

12011312331 is a wasteful number, since it uses less digits than its factorization.

12011312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17131 (or 17128 counting only the distinct ones).

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

Adding to 12011312331 its reverse (13321311021), we get a palindrome (25332623352).

The spelling of 12011312331 in words is "twelve billion, eleven million, three hundred twelve thousand, three hundred thirty-one".