12011031123 has 64 divisors (see below), whose sum is σ = 20466432000. Its totient is φ = 6094126080.

The previous prime is 12011031113. The next prime is 12011031161. The reversal of 12011031123 is 32113011021.

It is a happy number.

It is not a de Polignac number, because 12011031123 - 2⁶ = 12011031059 is a prime.

It is a super-2 number, since 2×12011031123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12011031113) 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 63 ways as a sum of consecutive naturals, for example, 2221978 + ... + 2227376.

It is an arithmetic number, because the mean of its divisors is an integer number (319788000).

Almost surely, 2^12011031123 is an apocalyptic number.

12011031123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12011031123 is a deficient number, since it is larger than the sum of its proper divisors (8455400877).

12011031123 is a wasteful number, since it uses less digits than its factorization.

12011031123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 12011031123 its reverse (32113011021), we get a palindrome (44124042144).

The spelling of 12011031123 in words is "twelve billion, eleven million, thirty-one thousand, one hundred twenty-three".