22009217 has 4 divisors (see below), whose sum is σ = 22020096. Its totient is φ = 21998340.

The previous prime is 22009189. The next prime is 22009241. The reversal of 22009217 is 71290022.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 71290022 = 2 ⋅35645011.

It is a cyclic number.

It is not a de Polignac number, because 22009217 - 2⁶ = 22009153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22009192 and 22009201.

It is not an unprimeable number, because it can be changed into a prime (22009417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1409 + ... + 6782.

It is an arithmetic number, because the mean of its divisors is an integer number (5505024).

Almost surely, 2^22009217 is an apocalyptic number.

It is an amenable number.

22009217 is a deficient number, since it is larger than the sum of its proper divisors (10879).

22009217 is an equidigital number, since it uses as much as digits as its factorization.

22009217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10878.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 22009217 is about 4691.3981924369. The cubic root of 22009217 is about 280.2430585059.

Adding to 22009217 its reverse (71290022), we get a palindrome (93299239).

The spelling of 22009217 in words is "twenty-two million, nine thousand, two hundred seventeen".