222657221 has 8 divisors (see below), whose sum is σ = 230502144. Its totient is φ = 214853760.

The previous prime is 222657203. The next prime is 222657223. The reversal of 222657221 is 122756222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 222657221 - 2¹⁰ = 222656197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222657223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770 + ... + 21116.

It is an arithmetic number, because the mean of its divisors is an integer number (28812768).

Almost surely, 2^222657221 is an apocalyptic number.

It is an amenable number.

222657221 is a deficient number, since it is larger than the sum of its proper divisors (7844923).

222657221 is a wasteful number, since it uses less digits than its factorization.

222657221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20731.

The product of its digits is 6720, while the sum is 29.

The square root of 222657221 is about 14921.7030194278. The cubic root of 222657221 is about 606.1018292939.

Subtracting from 222657221 its reverse (122756222), we obtain a palindrome (99900999).

The spelling of 222657221 in words is "two hundred twenty-two million, six hundred fifty-seven thousand, two hundred twenty-one".