12521307 has 4 divisors (see below), whose sum is σ = 16695080. Its totient is φ = 8347536.

The previous prime is 12521293. The next prime is 12521309. The reversal of 12521307 is 70312521.

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

It is not a de Polignac number, because 12521307 - 2⁴ = 12521291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521309) 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, 2086882 + ... + 2086887.

It is an arithmetic number, because the mean of its divisors is an integer number (4173770).

Almost surely, 2^12521307 is an apocalyptic number.

12521307 is a deficient number, since it is larger than the sum of its proper divisors (4173773).

12521307 is an equidigital number, since it uses as much as digits as its factorization.

12521307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173772.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 12521307 is about 3538.5458877906. The cubic root of 12521307 is about 232.2112312723.

Adding to 12521307 its reverse (70312521), we get a palindrome (82833828).

The spelling of 12521307 in words is "twelve million, five hundred twenty-one thousand, three hundred seven".