222202221 has 4 divisors (see below), whose sum is σ = 296269632. Its totient is φ = 148134812.

The previous prime is 222202181. The next prime is 222202231. The reversal of 222202221 is 122202222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222202221 - 2⁹ = 222201709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222202231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37033701 + ... + 37033706.

It is an arithmetic number, because the mean of its divisors is an integer number (74067408).

Almost surely, 2^222202221 is an apocalyptic number.

It is an amenable number.

222202221 is a deficient number, since it is larger than the sum of its proper divisors (74067411).

222202221 is an equidigital number, since it uses as much as digits as its factorization.

222202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74067410.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 222202221 is about 14906.4489735148. The cubic root of 222202221 is about 605.6886914158.

Adding to 222202221 its reverse (122202222), we get a palindrome (344404443).

Subtracting from 222202221 its reverse (122202222), we obtain a palindrome (99999999).

The spelling of 222202221 in words is "two hundred twenty-two million, two hundred two thousand, two hundred twenty-one".