12101112312 has 128 divisors (see below), whose sum is σ = 33772723200. Its totient is φ = 3590811648.

The previous prime is 12101112299. The next prime is 12101112313. The reversal of 12101112312 is 21321110121.

It is a junction number, because it is equal to n+sod(n) for n = 12101112291 and 12101112300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101112313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8503233 + ... + 8504655.

It is an arithmetic number, because the mean of its divisors is an integer number (263849400).

Almost surely, 2^12101112312 is an apocalyptic number.

12101112312 is a gapful number since it is divisible by the number (12) 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 12101112312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16886361600).

12101112312 is an abundant number, since it is smaller than the sum of its proper divisors (21671610888).

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

12101112312 is a wasteful number, since it uses less digits than its factorization.

12101112312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565 (or 2561 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12101112312 its reverse (21321110121), we get a palindrome (33422222433).

The spelling of 12101112312 in words is "twelve billion, one hundred one million, one hundred twelve thousand, three hundred twelve".