13221211 has 4 divisors (see below), whose sum is σ = 13290624. Its totient is φ = 13151800.

The previous prime is 13221209. The next prime is 13221227. The reversal of 13221211 is 11212231.

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

It is a cyclic number.

It is not a de Polignac number, because 13221211 - 2¹ = 13221209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13221191 and 13221200.

It is not an unprimeable number, because it can be changed into a prime (13221011) 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, 34420 + ... + 34801.

It is an arithmetic number, because the mean of its divisors is an integer number (3322656).

Almost surely, 2^13221211 is an apocalyptic number.

13221211 is a deficient number, since it is larger than the sum of its proper divisors (69413).

13221211 is an equidigital number, since it uses as much as digits as its factorization.

13221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69412.

The product of its digits is 24, while the sum is 13.

The square root of 13221211 is about 3636.0983210029. The cubic root of 13221211 is about 236.4596697853.

Adding to 13221211 its reverse (11212231), we get a palindrome (24433442).

The spelling of 13221211 in words is "thirteen million, two hundred twenty-one thousand, two hundred eleven".