111909409920 has 1024 divisors, whose sum is σ = 498310963200. Its totient is φ = 23058432000.

The previous prime is 111909409883. The next prime is 111909409943. The reversal of 111909409920 is 29904909111.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 200914282 + ... + 200914838.

It is an arithmetic number, because the mean of its divisors is an integer number (486631800).

Almost surely, 2^111909409920 is an apocalyptic number.

111909409920 is a gapful number since it is divisible by the number (10) 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 111909409920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249155481600).

111909409920 is an abundant number, since it is smaller than the sum of its proper divisors (386401553280).

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

111909409920 is a wasteful number, since it uses less digits than its factorization.

111909409920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 111909409920 in words is "one hundred eleven billion, nine hundred nine million, four hundred nine thousand, nine hundred twenty".