13204521 has 12 divisors (see below), whose sum is σ = 20807280. Its totient is φ = 8002680.

The previous prime is 13204519. The next prime is 13204537. The reversal of 13204521 is 12540231.

13204521 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 is not a de Polignac number, because 13204521 - 2¹ = 13204519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13204494 and 13204503.

It is not an unprimeable number, because it can be changed into a prime (13204421) 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, 66591 + ... + 66788.

It is an arithmetic number, because the mean of its divisors is an integer number (1733940).

Almost surely, 2^13204521 is an apocalyptic number.

13204521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13204521 is a deficient number, since it is larger than the sum of its proper divisors (7602759).

13204521 is a wasteful number, since it uses less digits than its factorization.

13204521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133396 (or 133393 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 13204521 is about 3633.8025537995. The cubic root of 13204521 is about 236.3601283817.

Adding to 13204521 its reverse (12540231), we get a palindrome (25744752).

The spelling of 13204521 in words is "thirteen million, two hundred four thousand, five hundred twenty-one".