12123311112 has 192 divisors, whose sum is σ = 37106933760. Its totient is φ = 3542486400.

The previous prime is 12123311093. The next prime is 12123311113. The reversal of 12123311112 is 21111332121.

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 and also a Zuckerman number because it is divisible by the product of its digits.

It is not an unprimeable number, because it can be changed into a prime (12123311113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8518833 + ... + 8520255.

It is an arithmetic number, because the mean of its divisors is an integer number (193265280).

Almost surely, 2^12123311112 is an apocalyptic number.

12123311112 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 12123311112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18553466880).

12123311112 is an abundant number, since it is smaller than the sum of its proper divisors (24983622648).

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

12123311112 is a wasteful number, since it uses less digits than its factorization.

12123311112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824 (or 1817 counting only the distinct ones).

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

Adding to 12123311112 its reverse (21111332121), we get a palindrome (33234643233).

The spelling of 12123311112 in words is "twelve billion, one hundred twenty-three million, three hundred eleven thousand, one hundred twelve".