221011112220 has 96 divisors (see below), whose sum is σ = 656183275776. Its totient is φ = 55389004800.

The previous prime is 221011112167. The next prime is 221011112233. The reversal of 221011112220 is 22211110122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221011112220.

It is a congruent number.

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, 548035 + ... + 861605.

It is an arithmetic number, because the mean of its divisors is an integer number (6835242456).

Almost surely, 2^221011112220 is an apocalyptic number.

221011112220 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 221011112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328091637888).

221011112220 is an abundant number, since it is smaller than the sum of its proper divisors (435172163556).

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

221011112220 is a wasteful number, since it uses less digits than its factorization.

221011112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314291 (or 314289 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221011112220 its reverse (22211110122), we get a palindrome (243222222342).

The spelling of 221011112220 in words is "two hundred twenty-one billion, eleven million, one hundred twelve thousand, two hundred twenty".