221021112222 has 24 divisors (see below), whose sum is σ = 479384793576. Its totient is φ = 73595901456.

The previous prime is 221021112217. The next prime is 221021112229. The reversal of 221021112222 is 222211120122.

It is a happy number.

221021112222 is a `hidden beast` number, since 221 + 0 + 211 + 12 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221021112195 and 221021112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021112229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6466033 + ... + 6500124.

It is an arithmetic number, because the mean of its divisors is an integer number (19974366399).

Almost surely, 2^221021112222 is an apocalyptic number.

221021112222 is an abundant number, since it is smaller than the sum of its proper divisors (258363681354).

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

221021112222 is a wasteful number, since it uses less digits than its factorization.

221021112222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12967112 (or 12967109 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221021112222 its reverse (222211120122), we get a palindrome (443232232344).

The spelling of 221021112222 in words is "two hundred twenty-one billion, twenty-one million, one hundred twelve thousand, two hundred twenty-two".