2222112221 has 12 divisors (see below), whose sum is σ = 2628721440. Its totient is φ = 1872382680.

The previous prime is 2222112199. The next prime is 2222112229. The reversal of 2222112221 is 1222112222.

It is a happy number.

It is not a de Polignac number, because 2222112221 - 2⁶ = 2222112157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2222112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222112229) 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, 381425 + ... + 387206.

It is an arithmetic number, because the mean of its divisors is an integer number (219060120).

Almost surely, 2^2222112221 is an apocalyptic number.

It is an amenable number.

2222112221 is a deficient number, since it is larger than the sum of its proper divisors (406609219).

2222112221 is an equidigital number, since it uses as much as digits as its factorization.

2222112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768704 (or 768697 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 2222112221 is about 47139.2853255117. The cubic root of 2222112221 is about 1304.9343480231.

Adding to 2222112221 its reverse (1222112222), we get a palindrome (3444224443).

Subtracting from 2222112221 its reverse (1222112222), we obtain a palindrome (999999999).

The spelling of 2222112221 in words is "two billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".