111212110220 has 96 divisors (see below), whose sum is σ = 245028744576. Its totient is φ = 42319411200.

The previous prime is 111212110199. The next prime is 111212110231. The reversal of 111212110220 is 22011212111.

It is a junction number, because it is equal to n+sod(n) for n = 111212110195 and 111212110204.

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, 84187160 + ... + 84188480.

It is an arithmetic number, because the mean of its divisors is an integer number (2552382756).

Almost surely, 2^111212110220 is an apocalyptic number.

111212110220 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 111212110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122514372288).

111212110220 is an abundant number, since it is smaller than the sum of its proper divisors (133816634356).

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

111212110220 is a wasteful number, since it uses less digits than its factorization.

111212110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211 (or 2209 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111212110220 its reverse (22011212111), we get a palindrome (133223322331).

The spelling of 111212110220 in words is "one hundred eleven billion, two hundred twelve million, one hundred ten thousand, two hundred twenty".