222201221 has 4 divisors (see below), whose sum is σ = 242401344. Its totient is φ = 202001100.

The previous prime is 222201197. The next prime is 222201247. The reversal of 222201221 is 122102222.

222201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 222201221 - 2⁶ = 222201157 is a prime.

It is a super-2 number, since 2×222201221² = 98746765227781682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222201196 and 222201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222201121) 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, 10100045 + ... + 10100066.

It is an arithmetic number, because the mean of its divisors is an integer number (60600336).

Almost surely, 2^222201221 is an apocalyptic number.

It is an amenable number.

222201221 is a deficient number, since it is larger than the sum of its proper divisors (20200123).

222201221 is a wasteful number, since it uses less digits than its factorization.

222201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20200122.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 222201221 is about 14906.4154309478. The cubic root of 222201221 is about 605.6877827996.

Adding to 222201221 its reverse (122102222), we get a palindrome (344303443).

The spelling of 222201221 in words is "two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".