222221231 has 4 divisors (see below), whose sum is σ = 225864264. Its totient is φ = 218578200.

The previous prime is 222221227. The next prime is 222221257. The reversal of 222221231 is 132122222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 222221231 - 2² = 222221227 is a prime.

It is a super-2 number, since 2×222221231² = 98764551014310722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221201) 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 3 ways as a sum of consecutive naturals, for example, 1821425 + ... + 1821546.

It is an arithmetic number, because the mean of its divisors is an integer number (56466066).

Almost surely, 2^222221231 is an apocalyptic number.

222221231 is a deficient number, since it is larger than the sum of its proper divisors (3643033).

222221231 is an equidigital number, since it uses as much as digits as its factorization.

222221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643032.

The product of its digits is 192, while the sum is 17.

The square root of 222221231 is about 14907.0866033575. The cubic root of 222221231 is about 605.7059636909.

Adding to 222221231 its reverse (132122222), we get a palindrome (354343453).

Subtracting from 222221231 its reverse (132122222), we obtain a palindrome (90099009).

The spelling of 222221231 in words is "two hundred twenty-two million, two hundred twenty-one thousand, two hundred thirty-one".