13170321 has 12 divisors (see below), whose sum is σ = 19680180. Its totient is φ = 8477280.

The previous prime is 13170277. The next prime is 13170337. The reversal of 13170321 is 12307131.

13170321 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8910225 + 4260096 = 2985^2 + 2064^2 .

It is not a de Polignac number, because 13170321 - 2⁹ = 13169809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13170294 and 13170303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13170721) 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, 24970 + ... + 25491.

It is an arithmetic number, because the mean of its divisors is an integer number (1640015).

Almost surely, 2^13170321 is an apocalyptic number.

It is an amenable number.

13170321 is a deficient number, since it is larger than the sum of its proper divisors (6509859).

13170321 is a wasteful number, since it uses less digits than its factorization.

13170321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50496 (or 50493 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 13170321 is about 3629.0936885123. The cubic root of 13170321 is about 236.1558926436.

Adding to 13170321 its reverse (12307131), we get a palindrome (25477452).

The spelling of 13170321 in words is "thirteen million, one hundred seventy thousand, three hundred twenty-one".