111921912 has 64 divisors (see below), whose sum is σ = 314781600. Its totient is φ = 37301472.

The previous prime is 111921911. The next prime is 111921917. The reversal of 111921912 is 219129111.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 not an unprimeable number, because it can be changed into a prime (111921911) 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, 14298 + ... + 20694.

Almost surely, 2^111921912 is an apocalyptic number.

111921912 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 111921912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157390800).

111921912 is an abundant number, since it is smaller than the sum of its proper divisors (202859688).

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

111921912 is an frugal number, since it uses more digits than its factorization.

111921912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6424 (or 6402 counting only the distinct ones).

The product of its digits is 324, while the sum is 27.

The square root of 111921912 is about 10579.3152897529. The cubic root of 111921912 is about 481.9164010818.

The spelling of 111921912 in words is "one hundred eleven million, nine hundred twenty-one thousand, nine hundred twelve".