13660521 has 16 divisors (see below), whose sum is σ = 21052800. Its totient is φ = 7717248.

The previous prime is 13660499. The next prime is 13660529. The reversal of 13660521 is 12506631.

It is not a de Polignac number, because 13660521 - 2⁵ = 13660489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13660491 and 13660500.

It is not an unprimeable number, because it can be changed into a prime (13660529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1786 + ... + 5523.

It is an arithmetic number, because the mean of its divisors is an integer number (1315800).

Almost surely, 2^13660521 is an apocalyptic number.

It is an amenable number.

13660521 is a deficient number, since it is larger than the sum of its proper divisors (7392279).

13660521 is an equidigital number, since it uses as much as digits as its factorization.

13660521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7408.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 13660521 is about 3696.0142045182. The cubic root of 13660521 is about 239.0501869945.

The spelling of 13660521 in words is "thirteen million, six hundred sixty thousand, five hundred twenty-one".