12521065 has 4 divisors (see below), whose sum is σ = 15025284. Its totient is φ = 10016848.

The previous prime is 12521053. The next prime is 12521081. The reversal of 12521065 is 56012521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56012521 = 23 ⋅2435327.

It can be written as a sum of positive squares in 2 ways, for example, as 2917264 + 9603801 = 1708^2 + 3099^2 .

It is a cyclic number.

It is not a de Polignac number, because 12521065 - 2⁹ = 12520553 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252102 + ... + 1252111.

It is an arithmetic number, because the mean of its divisors is an integer number (3756321).

Almost surely, 2^12521065 is an apocalyptic number.

It is an amenable number.

12521065 is a deficient number, since it is larger than the sum of its proper divisors (2504219).

12521065 is an equidigital number, since it uses as much as digits as its factorization.

12521065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504218.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 12521065 is about 3538.5116927884. The cubic root of 12521065 is about 232.2097352761.

Adding to 12521065 its reverse (56012521), we get a palindrome (68533586).

The spelling of 12521065 in words is "twelve million, five hundred twenty-one thousand, sixty-five".