23111113212 has 96 divisors (see below), whose sum is σ = 65426457600. Its totient is φ = 6996758400.

The previous prime is 23111113169. The next prime is 23111113229. The reversal of 23111113212 is 21231111132.

23111113212 is a `hidden beast` number, since 231 + 1 + 111 + 321 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1332637 + ... + 1349867.

It is an arithmetic number, because the mean of its divisors is an integer number (681525600).

Almost surely, 2^23111113212 is an apocalyptic number.

23111113212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23111113212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32713228800).

23111113212 is an abundant number, since it is smaller than the sum of its proper divisors (42315344388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23111113212 is a wasteful number, since it uses less digits than its factorization.

23111113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18384 (or 18376 counting only the distinct ones).

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

Adding to 23111113212 its reverse (21231111132), we get a palindrome (44342224344).

The spelling of 23111113212 in words is "twenty-three billion, one hundred eleven million, one hundred thirteen thousand, two hundred twelve".