12120111312 has 80 divisors (see below), whose sum is σ = 32181339072. Its totient is φ = 3927813120.

The previous prime is 12120111287. The next prime is 12120111319. The reversal of 12120111312 is 21311102121.

It is a super-2 number, since 2×12120111312² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12120111291 and 12120111300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120111319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4077987 + ... + 4080957.

Almost surely, 2^12120111312 is an apocalyptic number.

12120111312 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 12120111312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16090669536).

12120111312 is an abundant number, since it is smaller than the sum of its proper divisors (20061227760).

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

12120111312 is a wasteful number, since it uses less digits than its factorization.

12120111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316 (or 5310 counting only the distinct ones).

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

Adding to 12120111312 its reverse (21311102121), we get a palindrome (33431213433).

The spelling of 12120111312 in words is "twelve billion, one hundred twenty million, one hundred eleven thousand, three hundred twelve".