12521306 has 16 divisors (see below), whose sum is σ = 21532416. Its totient is φ = 5349456.

The previous prime is 12521293. The next prime is 12521309. The reversal of 12521306 is 60312521.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 3920 + ... + 6356.

It is an arithmetic number, because the mean of its divisors is an integer number (1345776).

Almost surely, 2^12521306 is an apocalyptic number.

12521306 is a deficient number, since it is larger than the sum of its proper divisors (9011110).

12521306 is a wasteful number, since it uses less digits than its factorization.

12521306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 12521306 is about 3538.5457464897. The cubic root of 12521306 is about 232.2112250905.

Adding to 12521306 its reverse (60312521), we get a palindrome (72833827).

The spelling of 12521306 in words is "twelve million, five hundred twenty-one thousand, three hundred six".