13208521 has 4 divisors (see below), whose sum is σ = 13243392. Its totient is φ = 13173652.

The previous prime is 13208483. The next prime is 13208557. The reversal of 13208521 is 12580231.

13208521 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13208521 - 2¹³ = 13200329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13208492 and 13208501.

It is not an unprimeable number, because it can be changed into a prime (13208561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16861 + ... + 17626.

It is an arithmetic number, because the mean of its divisors is an integer number (3310848).

Almost surely, 2^13208521 is an apocalyptic number.

It is an amenable number.

13208521 is a deficient number, since it is larger than the sum of its proper divisors (34871).

13208521 is an equidigital number, since it uses as much as digits as its factorization.

13208521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34870.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 13208521 is about 3634.3528997608. The cubic root of 13208521 is about 236.3839925583.

Adding to 13208521 its reverse (12580231), we get a palindrome (25788752).

The spelling of 13208521 in words is "thirteen million, two hundred eight thousand, five hundred twenty-one".