12821307 has 4 divisors (see below), whose sum is σ = 17095080. Its totient is φ = 8547536.

The previous prime is 12821299. The next prime is 12821311. The reversal of 12821307 is 70312821.

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

It is a cyclic number.

It is not a de Polignac number, because 12821307 - 2³ = 12821299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12821317) 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, 2136882 + ... + 2136887.

It is an arithmetic number, because the mean of its divisors is an integer number (4273770).

Almost surely, 2^12821307 is an apocalyptic number.

12821307 is a deficient number, since it is larger than the sum of its proper divisors (4273773).

12821307 is an equidigital number, since it uses as much as digits as its factorization.

12821307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273772.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12821307 is about 3580.6852696097. The cubic root of 12821307 is about 234.0511430328.

The spelling of 12821307 in words is "twelve million, eight hundred twenty-one thousand, three hundred seven".