13040321 has 6 divisors (see below), whose sum is σ = 15169410. Its totient is φ = 11177376.

The previous prime is 13040297. The next prime is 13040323. The reversal of 13040321 is 12304031.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 790321 = 3500^2 + 889^2 .

It is not a de Polignac number, because 13040321 - 2⁶ = 13040257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13040296 and 13040305.

It is not an unprimeable number, because it can be changed into a prime (13040323) 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 5 ways as a sum of consecutive naturals, for example, 133016 + ... + 133113.

It is an arithmetic number, because the mean of its divisors is an integer number (2528235).

Almost surely, 2^13040321 is an apocalyptic number.

It is an amenable number.

13040321 is a deficient number, since it is larger than the sum of its proper divisors (2129089).

13040321 is an equidigital number, since it uses as much as digits as its factorization.

13040321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266143 (or 266136 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13040321 is about 3611.1384631443. The cubic root of 13040321 is about 235.3763157336.

Adding to 13040321 its reverse (12304031), we get a palindrome (25344352).

The spelling of 13040321 in words is "thirteen million, forty thousand, three hundred twenty-one".