12821597 has 4 divisors (see below), whose sum is σ = 12863136. Its totient is φ = 12780060.

The previous prime is 12821581. The next prime is 12821617. The reversal of 12821597 is 79512821.

12821597 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79512821 = 467 ⋅170263.

It is a cyclic number.

It is not a de Polignac number, because 12821597 - 2⁴ = 12821581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12821527) 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, 20303 + ... + 20924.

It is an arithmetic number, because the mean of its divisors is an integer number (3215784).

Almost surely, 2^12821597 is an apocalyptic number.

It is an amenable number.

12821597 is a deficient number, since it is larger than the sum of its proper divisors (41539).

12821597 is an equidigital number, since it uses as much as digits as its factorization.

12821597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41538.

The product of its digits is 10080, while the sum is 35.

The square root of 12821597 is about 3580.7257644226. The cubic root of 12821597 is about 234.0529076558.

The spelling of 12821597 in words is "twelve million, eight hundred twenty-one thousand, five hundred ninety-seven".