12821345 has 8 divisors (see below), whose sum is σ = 15418176. Its totient is φ = 10235376.

The previous prime is 12821329. The next prime is 12821357. The reversal of 12821345 is 54312821.

12821345 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12821345 - 2⁴ = 12821329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 164 + ... + 5066.

It is an arithmetic number, because the mean of its divisors is an integer number (1927272).

Almost surely, 2^12821345 is an apocalyptic number.

It is an amenable number.

12821345 is a deficient number, since it is larger than the sum of its proper divisors (2596831).

12821345 is an equidigital number, since it uses as much as digits as its factorization.

12821345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431.

The product of its digits is 1920, while the sum is 26.

The square root of 12821345 is about 3580.6905758527. The cubic root of 12821345 is about 234.0513742608.

The spelling of 12821345 in words is "twelve million, eight hundred twenty-one thousand, three hundred forty-five".