111721320 has 96 divisors (see below), whose sum is σ = 367567200. Its totient is φ = 29425536.

The previous prime is 111721307. The next prime is 111721339. The reversal of 111721320 is 23127111.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 111721293 and 111721302.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28011 + ... + 31749.

It is an arithmetic number, because the mean of its divisors is an integer number (3828825).

Almost surely, 2^111721320 is an apocalyptic number.

111721320 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 111721320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183783600).

111721320 is an abundant number, since it is smaller than the sum of its proper divisors (255845880).

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

111721320 is a wasteful number, since it uses less digits than its factorization.

111721320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3839 (or 3832 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 111721320 is about 10569.8306514343. The cubic root of 111721320 is about 481.6283240885.

Adding to 111721320 its reverse (23127111), we get a palindrome (134848431).

The spelling of 111721320 in words is "one hundred eleven million, seven hundred twenty-one thousand, three hundred twenty".