222646221 has 12 divisors (see below), whose sum is σ = 367543072. Its totient is φ = 127226376.

The previous prime is 222646219. The next prime is 222646223. The reversal of 222646221 is 122646222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (222646219) and next prime (222646223).

It is not a de Polignac number, because 222646221 - 2¹ = 222646219 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 (222646223) 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, 1766971 + ... + 1767096.

Almost surely, 2^222646221 is an apocalyptic number.

222646221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222646221 is a deficient number, since it is larger than the sum of its proper divisors (144896851).

222646221 is a wasteful number, since it uses less digits than its factorization.

222646221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534080 (or 3534077 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 222646221 is about 14921.3344242397. The cubic root of 222646221 is about 606.0918479874.

Subtracting from 222646221 its reverse (122646222), we obtain a palindrome (99999999).

The spelling of 222646221 in words is "two hundred twenty-two million, six hundred forty-six thousand, two hundred twenty-one".