22205221 has 4 divisors (see below), whose sum is σ = 22229152. Its totient is φ = 22181292.

The previous prime is 22205203. The next prime is 22205237. The reversal of 22205221 is 12250222.

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 22205221 - 2⁷ = 22205093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22205195 and 22205204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22205201) 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, 10515 + ... + 12448.

It is an arithmetic number, because the mean of its divisors is an integer number (5557288).

Almost surely, 2^22205221 is an apocalyptic number.

It is an amenable number.

22205221 is a deficient number, since it is larger than the sum of its proper divisors (23931).

22205221 is an equidigital number, since it uses as much as digits as its factorization.

22205221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23930.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22205221 is about 4712.2416109533. The cubic root of 22205221 is about 281.0725065446.

Adding to 22205221 its reverse (12250222), we get a palindrome (34455443).

The spelling of 22205221 in words is "twenty-two million, two hundred five thousand, two hundred twenty-one".