111421800 has 288 divisors, whose sum is σ = 441043200. Its totient is φ = 24675840.

The previous prime is 111421789. The next prime is 111421823. The reversal of 111421800 is 8124111.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 466081 + ... + 466319.

It is an arithmetic number, because the mean of its divisors is an integer number (1531400).

Almost surely, 2^111421800 is an apocalyptic number.

111421800 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 111421800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220521600).

111421800 is an abundant number, since it is smaller than the sum of its proper divisors (329621400).

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

111421800 is a wasteful number, since it uses less digits than its factorization.

111421800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 111421800 is about 10555.6525141746. The cubic root of 111421800 is about 481.1975306826.

Adding to 111421800 its reverse (8124111), we get a palindrome (119545911).

The spelling of 111421800 in words is "one hundred eleven million, four hundred twenty-one thousand, eight hundred".