13312221 has 8 divisors (see below), whose sum is σ = 19115040. Its totient is φ = 8192112.

The previous prime is 13312199. The next prime is 13312231. The reversal of 13312221 is 12221331.

13312221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13312221 - 2⁷ = 13312093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13312231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170631 + ... + 170708.

It is an arithmetic number, because the mean of its divisors is an integer number (2389380).

Almost surely, 2^13312221 is an apocalyptic number.

It is an amenable number.

13312221 is a deficient number, since it is larger than the sum of its proper divisors (5802819).

13312221 is a wasteful number, since it uses less digits than its factorization.

13312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341355.

The product of its digits is 72, while the sum is 15.

The square root of 13312221 is about 3648.5916461013. The cubic root of 13312221 is about 237.0009969870. Note that the first 3 decimals are identical.

Adding to 13312221 its reverse (12221331), we get a palindrome (25533552).

The spelling of 13312221 in words is "thirteen million, three hundred twelve thousand, two hundred twenty-one".