12921307 has 4 divisors (see below), whose sum is σ = 14767216. Its totient is φ = 11075400.

The previous prime is 12921299. The next prime is 12921329. The reversal of 12921307 is 70312921.

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

It is not a de Polignac number, because 12921307 - 2³ = 12921299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12921397) 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, 922944 + ... + 922957.

It is an arithmetic number, because the mean of its divisors is an integer number (3691804).

Almost surely, 2^12921307 is an apocalyptic number.

12921307 is a deficient number, since it is larger than the sum of its proper divisors (1845909).

12921307 is an equidigital number, since it uses as much as digits as its factorization.

12921307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845908.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12921307 is about 3594.6219550879. The cubic root of 12921307 is about 234.6580631405.

The spelling of 12921307 in words is "twelve million, nine hundred twenty-one thousand, three hundred seven".