22565221 has 4 divisors (see below), whose sum is σ = 25788832. Its totient is φ = 19341612.

The previous prime is 22565209. The next prime is 22565237. The reversal of 22565221 is 12256522.

It is a happy number.

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 22565221 - 2⁵ = 22565189 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 (22565261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1611795 + ... + 1611808.

It is an arithmetic number, because the mean of its divisors is an integer number (6447208).

Almost surely, 2^22565221 is an apocalyptic number.

It is an amenable number.

22565221 is a deficient number, since it is larger than the sum of its proper divisors (3223611).

22565221 is an equidigital number, since it uses as much as digits as its factorization.

22565221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223610.

The product of its digits is 2400, while the sum is 25.

The square root of 22565221 is about 4750.2864124177. The cubic root of 22565221 is about 282.5833246779.

The spelling of 22565221 in words is "twenty-two million, five hundred sixty-five thousand, two hundred twenty-one".