13520321 has 8 divisors (see below), whose sum is σ = 14349960. Its totient is φ = 12694528.

The previous prime is 13520303. The next prime is 13520333. The reversal of 13520321 is 12302531.

13520321 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 4 ways, for example, as 2062096 + 11458225 = 1436^2 + 3385^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13520321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a deceptive number, since it divides R_13520320.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13520321.

It is not an unprimeable number, because it can be changed into a prime (13520921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9845 + ... + 11133.

It is an arithmetic number, because the mean of its divisors is an integer number (1793745).

Almost surely, 2^13520321 is an apocalyptic number.

It is an amenable number.

13520321 is a deficient number, since it is larger than the sum of its proper divisors (829639).

13520321 is a wasteful number, since it uses less digits than its factorization.

13520321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 13520321 is about 3676.9989121565. The cubic root of 13520321 is about 238.2295704062.

Adding to 13520321 its reverse (12302531), we get a palindrome (25822852).

The spelling of 13520321 in words is "thirteen million, five hundred twenty thousand, three hundred twenty-one".