12759221 has 4 divisors (see below), whose sum is σ = 12852492. Its totient is φ = 12665952.

The previous prime is 12759209. The next prime is 12759223. The reversal of 12759221 is 12295721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4778596 + 7980625 = 2186^2 + 2825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12759221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12759223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 46430 + ... + 46703.

It is an arithmetic number, because the mean of its divisors is an integer number (3213123).

Almost surely, 2^12759221 is an apocalyptic number.

It is an amenable number.

12759221 is a deficient number, since it is larger than the sum of its proper divisors (93271).

12759221 is an equidigital number, since it uses as much as digits as its factorization.

12759221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93270.

The product of its digits is 2520, while the sum is 29.

The square root of 12759221 is about 3572.0051791676. The cubic root of 12759221 is about 233.6727412036.

The spelling of 12759221 in words is "twelve million, seven hundred fifty-nine thousand, two hundred twenty-one".