23121112212 has 108 divisors (see below), whose sum is σ = 65735750080. Its totient is φ = 6843402720.

The previous prime is 23121112207. The next prime is 23121112229. The reversal of 23121112212 is 21221112132.

23121112212 is a `hidden beast` number, since 231 + 211 + 1 + 221 + 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 polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 125589 + ... + 249027.

Almost surely, 2^23121112212 is an apocalyptic number.

23121112212 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 23121112212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32867875040).

23121112212 is an abundant number, since it is smaller than the sum of its proper divisors (42614637868).

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

23121112212 is a wasteful number, since it uses less digits than its factorization.

23121112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123514 (or 123498 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 23121112212 its reverse (21221112132), we get a palindrome (44342224344).

The spelling of 23121112212 in words is "twenty-three billion, one hundred twenty-one million, one hundred twelve thousand, two hundred twelve".