12111311011031 has 4 divisors (see below), whose sum is σ = 12224500833672. Its totient is φ = 11998121188392.

The previous prime is 12111311011021. The next prime is 12111311011097. The reversal of 12111311011031 is 13011011311121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111311011031 is a prime.

It is a super-2 number, since 2×12111311011031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111311011021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56594911160 + ... + 56594911373.

It is an arithmetic number, because the mean of its divisors is an integer number (3056125208418).

Almost surely, 2^{12111311011031} is an apocalyptic number.

12111311011031 is a deficient number, since it is larger than the sum of its proper divisors (113189822641).

12111311011031 is a wasteful number, since it uses less digits than its factorization.

12111311011031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113189822640.

The product of its (nonzero) digits is 18, while the sum is 17.

Adding to 12111311011031 its reverse (13011011311121), we get a palindrome (25122322322152).

The spelling of 12111311011031 in words is "twelve trillion, one hundred eleven billion, three hundred eleven million, eleven thousand, thirty-one".