222112221 has 16 divisors (see below), whose sum is σ = 304618944. Its totient is φ = 143852544.

The previous prime is 222112217. The next prime is 222112273. The reversal of 222112221 is 122211222.

It is not a de Polignac number, because 222112221 - 2² = 222112217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222112201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104061 + ... + 106173.

It is an arithmetic number, because the mean of its divisors is an integer number (19038684).

Almost surely, 2^222112221 is an apocalyptic number.

It is an amenable number.

222112221 is a deficient number, since it is larger than the sum of its proper divisors (82506723).

222112221 is a wasteful number, since it uses less digits than its factorization.

222112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3100.

The product of its digits is 64, while the sum is 15.

The square root of 222112221 is about 14903.4298401408. The cubic root of 222112221 is about 605.6069050390.

Adding to 222112221 its reverse (122211222), we get a palindrome (344323443).

Subtracting from 222112221 its reverse (122211222), we obtain a palindrome (99900999).

The spelling of 222112221 in words is "two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".