23121231111 has 16 divisors (see below), whose sum is σ = 37367646720. Its totient is φ = 14012867160.

The previous prime is 23121231101. The next prime is 23121231113. The reversal of 23121231111 is 11113212132.

It is not a de Polignac number, because 23121231111 - 2⁹ = 23121230599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121231113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38924335 + ... + 38924928.

It is an arithmetic number, because the mean of its divisors is an integer number (2335477920).

Almost surely, 2^23121231111 is an apocalyptic number.

23121231111 is a deficient number, since it is larger than the sum of its proper divisors (14246415609).

23121231111 is a wasteful number, since it uses less digits than its factorization.

23121231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77849283 (or 77849277 counting only the distinct ones).

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

Adding to 23121231111 its reverse (11113212132), we get a palindrome (34234443243).

The spelling of 23121231111 in words is "twenty-three billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred eleven".