111121212112 has 60 divisors (see below), whose sum is σ = 227769890916. Its totient is φ = 52510187520.

The previous prime is 111121212101. The next prime is 111121212143. The reversal of 111121212112 is 211212121111.

It can be written as a sum of positive squares in 2 ways, for example, as 13362435216 + 97758776896 = 115596^2 + 312664^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2408848 + ... + 2454544.

Almost surely, 2^111121212112 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 111121212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113884945458).

111121212112 is an abundant number, since it is smaller than the sum of its proper divisors (116648678804).

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

111121212112 is a wasteful number, since it uses less digits than its factorization.

111121212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46164 (or 46139 counting only the distinct ones).

The product of its digits is 16, while the sum is 16.

Adding to 111121212112 its reverse (211212121111), we get a palindrome (322333333223).

The spelling of 111121212112 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twelve".