111722220 has 96 divisors (see below), whose sum is σ = 349218240. Its totient is φ = 29652480.

The previous prime is 111722173. The next prime is 111722257. The reversal of 111722220 is 22227111.

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 = 111722193 and 111722202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168690 + ... + 169350.

It is an arithmetic number, because the mean of its divisors is an integer number (3637690).

Almost surely, 2^111722220 is an apocalyptic number.

111722220 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 111722220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174609120).

111722220 is an abundant number, since it is smaller than the sum of its proper divisors (237496020).

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

111722220 is a wasteful number, since it uses less digits than its factorization.

111722220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 111722220 is about 10569.8732253514. The cubic root of 111722220 is about 481.6296173789.

Adding to 111722220 its reverse (22227111), we get a palindrome (133949331).

The spelling of 111722220 in words is "one hundred eleven million, seven hundred twenty-two thousand, two hundred twenty".