222220221 has 4 divisors (see below), whose sum is σ = 296293632. Its totient is φ = 148146812.

The previous prime is 222220211. The next prime is 222220223. The reversal of 222220221 is 122022222.

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 222220221 - 2⁵ = 222220189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222220223) 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, 37036701 + ... + 37036706.

It is an arithmetic number, because the mean of its divisors is an integer number (74073408).

Almost surely, 2^222220221 is an apocalyptic number.

It is an amenable number.

222220221 is a deficient number, since it is larger than the sum of its proper divisors (74073411).

222220221 is an equidigital number, since it uses as much as digits as its factorization.

222220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74073410.

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

The square root of 222220221 is about 14907.0527268136. The cubic root of 222220221 is about 605.7050460409.

Adding to 222220221 its reverse (122022222), we get a palindrome (344242443).

The spelling of 222220221 in words is "two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".