13215321 has 12 divisors (see below), whose sum is σ = 21815872. Its totient is φ = 7551576.

The previous prime is 13215313. The next prime is 13215337. The reversal of 13215321 is 12351231.

13215321 is a `hidden beast` number, since 132 + 1 + 532 + 1 = 666.

13215321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13215321 - 2³ = 13215313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13215294 and 13215303.

It is not an unprimeable number, because it can be changed into a prime (13215311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104821 + ... + 104946.

Almost surely, 2^13215321 is an apocalyptic number.

It is an amenable number.

13215321 is a deficient number, since it is larger than the sum of its proper divisors (8600551).

13215321 is a wasteful number, since it uses less digits than its factorization.

13215321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209780 (or 209777 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 13215321 is about 3635.2882966829. The cubic root of 13215321 is about 236.4245506038.

Adding to 13215321 its reverse (12351231), we get a palindrome (25566552).

The spelling of 13215321 in words is "thirteen million, two hundred fifteen thousand, three hundred twenty-one".