111211102222220 has 384 divisors, whose sum is σ = 316413235353600. Its totient is φ = 31707235123200.

The previous prime is 111211102222159. The next prime is 111211102222223. The reversal of 111211102222220 is 22222201112111.

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 = 111211102222192 and 111211102222201.

It is not an unprimeable number, because it can be changed into a prime (111211102222223) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1859407676 + ... + 1859467484.

It is an arithmetic number, because the mean of its divisors is an integer number (823992800400).

Almost surely, 2^{111211102222220} is an apocalyptic number.

111211102222220 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 111211102222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158206617676800).

111211102222220 is an abundant number, since it is smaller than the sum of its proper divisors (205202133131380).

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

111211102222220 is a wasteful number, since it uses less digits than its factorization.

111211102222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60689 (or 60687 counting only the distinct ones).

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

Adding to 111211102222220 its reverse (22222201112111), we get a palindrome (133433303334331).

The spelling of 111211102222220 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred two million, two hundred twenty-two thousand, two hundred twenty".