12696521 has 4 divisors (see below), whose sum is σ = 12936132. Its totient is φ = 12456912.

The previous prime is 12696517. The next prime is 12696527. The reversal of 12696521 is 12569621.

It is a happy number.

12696521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6250000 + 6446521 = 2500^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 12696521 - 2² = 12696517 is a prime.

It is a super-2 number, since 2×12696521² = 322403291006882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12696527) 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 3 ways as a sum of consecutive naturals, for example, 119726 + ... + 119831.

It is an arithmetic number, because the mean of its divisors is an integer number (3234033).

Almost surely, 2^12696521 is an apocalyptic number.

It is an amenable number.

12696521 is a deficient number, since it is larger than the sum of its proper divisors (239611).

12696521 is an equidigital number, since it uses as much as digits as its factorization.

12696521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239610.

The product of its digits is 6480, while the sum is 32.

The square root of 12696521 is about 3563.2177873377. The cubic root of 12696521 is about 233.2893493058.

The spelling of 12696521 in words is "twelve million, six hundred ninety-six thousand, five hundred twenty-one".