111121321312 has 96 divisors (see below), whose sum is σ = 231379110144. Its totient is φ = 52457932800.

The previous prime is 111121321309. The next prime is 111121321357. The reversal of 111121321312 is 213123121111.

It is a self number, because there is not a number n which added to its sum of digits gives 111121321312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9510418 + ... + 9522094.

It is an arithmetic number, because the mean of its divisors is an integer number (2410199064).

Almost surely, 2^111121321312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111121321312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115689555072).

111121321312 is an abundant number, since it is smaller than the sum of its proper divisors (120257788832).

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

111121321312 is a wasteful number, since it uses less digits than its factorization.

111121321312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11952 (or 11944 counting only the distinct ones).

The product of its digits is 72, while the sum is 19.

Adding to 111121321312 its reverse (213123121111), we get a palindrome (324244442423).

The spelling of 111121321312 in words is "one hundred eleven billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred twelve".