13331221 has 8 divisors (see below), whose sum is σ = 13772160. Its totient is φ = 12896928.

The previous prime is 13331203. The next prime is 13331231. The reversal of 13331221 is 12213331.

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

It is a cyclic number.

It is not a de Polignac number, because 13331221 - 2⁵ = 13331189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13331195 and 13331204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13331231) 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 7 ways as a sum of consecutive naturals, for example, 2590 + ... + 5776.

It is an arithmetic number, because the mean of its divisors is an integer number (1721520).

Almost surely, 2^13331221 is an apocalyptic number.

It is an amenable number.

13331221 is a deficient number, since it is larger than the sum of its proper divisors (440939).

13331221 is an equidigital number, since it uses as much as digits as its factorization.

13331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323.

The product of its digits is 108, while the sum is 16.

The square root of 13331221 is about 3651.1944620905. The cubic root of 13331221 is about 237.1136973975.

Adding to 13331221 its reverse (12213331), we get a palindrome (25544552).

The spelling of 13331221 in words is "thirteen million, three hundred thirty-one thousand, two hundred twenty-one".