13221366 has 32 divisors (see below), whose sum is σ = 27820800. Its totient is φ = 4180704.

The previous prime is 13221353. The next prime is 13221379. The reversal of 13221366 is 66312231.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13221353) and next prime (13221379).

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20241 + ... + 20883.

It is an arithmetic number, because the mean of its divisors is an integer number (869400).

Almost surely, 2^13221366 is an apocalyptic number.

13221366 is an abundant number, since it is smaller than the sum of its proper divisors (14599434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13221366 is a wasteful number, since it uses less digits than its factorization.

13221366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820.

The product of its digits is 1296, while the sum is 24.

The square root of 13221366 is about 3636.1196349955. The cubic root of 13221366 is about 236.4605938334.

Adding to 13221366 its reverse (66312231), we get a palindrome (79533597).

The spelling of 13221366 in words is "thirteen million, two hundred twenty-one thousand, three hundred sixty-six".