11209221 has 12 divisors (see below), whose sum is σ = 17043520. Its totient is φ = 7079400.

The previous prime is 11209199. The next prime is 11209243. The reversal of 11209221 is 12290211.

It is an interprime number because it is at equal distance from previous prime (11209199) and next prime (11209243).

It is not a de Polignac number, because 11209221 - 2⁶ = 11209157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11209194 and 11209203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11209291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32605 + ... + 32946.

Almost surely, 2^11209221 is an apocalyptic number.

It is an amenable number.

11209221 is a deficient number, since it is larger than the sum of its proper divisors (5834299).

11209221 is a wasteful number, since it uses less digits than its factorization.

11209221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65576 (or 65573 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 11209221 is about 3348.0174730727. The cubic root of 11209221 is about 223.7991729467.

Adding to 11209221 its reverse (12290211), we get a palindrome (23499432).

The spelling of 11209221 in words is "eleven million, two hundred nine thousand, two hundred twenty-one".