111121223112 has 192 divisors, whose sum is σ = 331532248320. Its totient is φ = 34748310528.

The previous prime is 111121223089. The next prime is 111121223153. The reversal of 111121223112 is 211322121111.

It is a happy number.

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.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10470913 + ... + 10481519.

It is an arithmetic number, because the mean of its divisors is an integer number (1726730460).

Almost surely, 2^111121223112 is an apocalyptic number.

111121223112 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 111121223112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165766124160).

111121223112 is an abundant number, since it is smaller than the sum of its proper divisors (220411025208).

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

111121223112 is a wasteful number, since it uses less digits than its factorization.

111121223112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962 (or 10946 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 111121223112 its reverse (211322121111), we get a palindrome (322443344223).

The spelling of 111121223112 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred twelve".