12821225 has 6 divisors (see below), whose sum is σ = 15898350. Its totient is φ = 10256960.

The previous prime is 12821153. The next prime is 12821227. The reversal of 12821225 is 52212821.

12821225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 90601 + 12730624 = 301^2 + 3568^2 .

It is not a de Polignac number, because 12821225 - 2¹⁰ = 12820201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12821225.

It is not an unprimeable number, because it can be changed into a prime (12821227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256400 + ... + 256449.

It is an arithmetic number, because the mean of its divisors is an integer number (2649725).

Almost surely, 2^12821225 is an apocalyptic number.

It is an amenable number.

12821225 is a deficient number, since it is larger than the sum of its proper divisors (3077125).

12821225 is an equidigital number, since it uses as much as digits as its factorization.

12821225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512859 (or 512854 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 12821225 is about 3580.6738192692. The cubic root of 12821225 is about 234.0506440656.

The spelling of 12821225 in words is "twelve million, eight hundred twenty-one thousand, two hundred twenty-five".