111220212220 has 96 divisors (see below), whose sum is σ = 267389801280. Its totient is φ = 38519193600.

The previous prime is 111220212203. The next prime is 111220212221. The reversal of 111220212220 is 22212022111.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 111220212194 and 111220212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220212221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387484 + ... + 610396.

It is an arithmetic number, because the mean of its divisors is an integer number (2785310430).

Almost surely, 2^111220212220 is an apocalyptic number.

111220212220 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 111220212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133694900640).

111220212220 is an abundant number, since it is smaller than the sum of its proper divisors (156169589060).

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

111220212220 is a wasteful number, since it uses less digits than its factorization.

111220212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223055 (or 223053 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 111220212220 its reverse (22212022111), we get a palindrome (133432234331).

The spelling of 111220212220 in words is "one hundred eleven billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty".