22409221 has 4 divisors (see below), whose sum is σ = 22661100. Its totient is φ = 22157344.

The previous prime is 22409183. The next prime is 22409237. The reversal of 22409221 is 12290422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6964321 + 15444900 = 2639^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 22409221 - 2⁹ = 22408709 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 22409192 and 22409201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22409251) 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, 125806 + ... + 125983.

It is an arithmetic number, because the mean of its divisors is an integer number (5665275).

Almost surely, 2^22409221 is an apocalyptic number.

It is an amenable number.

22409221 is a deficient number, since it is larger than the sum of its proper divisors (251879).

22409221 is an equidigital number, since it uses as much as digits as its factorization.

22409221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251878.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 22409221 is about 4733.8378721710. The cubic root of 22409221 is about 281.9306244176.

Adding to 22409221 its reverse (12290422), we get a palindrome (34699643).

The spelling of 22409221 in words is "twenty-two million, four hundred nine thousand, two hundred twenty-one".