23123112111 has 24 divisors (see below), whose sum is σ = 36466646736. Its totient is φ = 14002381440.

The previous prime is 23123112107. The next prime is 23123112113. The reversal of 23123112111 is 11121132132.

It is not a de Polignac number, because 23123112111 - 2² = 23123112107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23123112113) 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, 23811 + ... + 216363.

It is an arithmetic number, because the mean of its divisors is an integer number (1519443614).

Almost surely, 2^23123112111 is an apocalyptic number.

23123112111 is a deficient number, since it is larger than the sum of its proper divisors (13343534625).

23123112111 is a wasteful number, since it uses less digits than its factorization.

23123112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193783 (or 193780 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 23123112111 its reverse (11121132132), we get a palindrome (34244244243).

It can be divided in two parts, 231231 and 12111, that added together give a palindrome (243342).

The spelling of 23123112111 in words is "twenty-three billion, one hundred twenty-three million, one hundred twelve thousand, one hundred eleven".