111211220122220 has 192 divisors, whose sum is σ = 245966410432512. Its totient is φ = 42185201760000.

The previous prime is 111211220122217. The next prime is 111211220122237. The reversal of 111211220122220 is 22221022112111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111211220122192 and 111211220122201.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23911246895 + ... + 23911251545.

It is an arithmetic number, because the mean of its divisors is an integer number (1281075054336).

Almost surely, 2^{111211220122220} is an apocalyptic number.

111211220122220 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 111211220122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122983205216256).

111211220122220 is an abundant number, since it is smaller than the sum of its proper divisors (134755190310292).

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

111211220122220 is a wasteful number, since it uses less digits than its factorization.

111211220122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8452 (or 8450 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111211220122220 its reverse (22221022112111), we get a palindrome (133432242234331).

The spelling of 111211220122220 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty".