221112111220 has 288 divisors, whose sum is σ = 635787258624. Its totient is φ = 62845009920.

The previous prime is 221112111217. The next prime is 221112111221. The reversal of 221112111220 is 22111211122.

It is a junction number, because it is equal to n+sod(n) for n = 221112111194 and 221112111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112111221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18272212 + ... + 18284308.

It is an arithmetic number, because the mean of its divisors is an integer number (2207594648).

Almost surely, 2^221112111220 is an apocalyptic number.

221112111220 is a gapful number since it is divisible by the number (20) 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 221112111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317893629312).

221112111220 is an abundant number, since it is smaller than the sum of its proper divisors (414675147404).

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

221112111220 is a wasteful number, since it uses less digits than its factorization.

221112111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12231 (or 12218 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221112111220 its reverse (22111211122), we get a palindrome (243223322342).

The spelling of 221112111220 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty".