222223221 has 96 divisors (see below), whose sum is σ = 394567680. Its totient is φ = 118972800.

The previous prime is 222223207. The next prime is 222223231. The reversal of 222223221 is 122322222.

222223221 is a `hidden beast` number, since 222 + 223 + 221 = 666.

It is not a de Polignac number, because 222223221 - 2⁵ = 222223189 is a prime.

It is a super-2 number, since 2×222223221² = 98766319903229682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 222223194 and 222223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222223231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2157456 + ... + 2157558.

It is an arithmetic number, because the mean of its divisors is an integer number (4110080).

Almost surely, 2^222223221 is an apocalyptic number.

It is an amenable number.

222223221 is a deficient number, since it is larger than the sum of its proper divisors (172344459).

222223221 is a wasteful number, since it uses less digits than its factorization.

222223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 204 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 222223221 is about 14907.1533499860. The cubic root of 222223221 is about 605.7077717259.

Adding to 222223221 its reverse (122322222), we get a palindrome (344545443).

Subtracting from 222223221 its reverse (122322222), we obtain a palindrome (99900999).

The spelling of 222223221 in words is "two hundred twenty-two million, two hundred twenty-three thousand, two hundred twenty-one".