12011111131 has 4 divisors (see below), whose sum is σ = 12037166064. Its totient is φ = 11985056200.

The previous prime is 12011111113. The next prime is 12011111149. The reversal of 12011111131 is 13111111021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13111111021 = 97 ⋅135166093.

It is an interprime number because it is at equal distance from previous prime (12011111113) and next prime (12011111149).

It is a cyclic number.

It is not a de Polignac number, because 12011111131 - 2⁹ = 12011110619 is a prime.

It is a super-2 number, since 2×12011111131² (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 (12011111111) 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 3 ways as a sum of consecutive naturals, for example, 13026775 + ... + 13027696.

It is an arithmetic number, because the mean of its divisors is an integer number (3009291516).

Almost surely, 2^12011111131 is an apocalyptic number.

12011111131 is a deficient number, since it is larger than the sum of its proper divisors (26054933).

12011111131 is an equidigital number, since it uses as much as digits as its factorization.

12011111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26054932.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 12011111131 its reverse (13111111021), we get a palindrome (25122222152).

The spelling of 12011111131 in words is "twelve billion, eleven million, one hundred eleven thousand, one hundred thirty-one".