13213321 has 6 divisors (see below), whose sum is σ = 14523866. Its totient is φ = 12012000.

The previous prime is 13213297. The next prime is 13213327. The reversal of 13213321 is 12331231.

13213321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 511225 = 3564^2 + 715^2 .

It is not a de Polignac number, because 13213321 - 2⁵ = 13213289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13213295 and 13213304.

It is not an unprimeable number, because it can be changed into a prime (13213327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54480 + ... + 54721.

Almost surely, 2^13213321 is an apocalyptic number.

13213321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13213321 is a deficient number, since it is larger than the sum of its proper divisors (1310545).

13213321 is a wasteful number, since it uses less digits than its factorization.

13213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109223 (or 109212 counting only the distinct ones).

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

The square root of 13213321 is about 3635.0132049279. The cubic root of 13213321 is about 236.4126232114.

Adding to 13213321 its reverse (12331231), we get a palindrome (25544552).

The spelling of 13213321 in words is "thirteen million, two hundred thirteen thousand, three hundred twenty-one".