12766521 has 8 divisors (see below), whose sum is σ = 17097280. Its totient is φ = 8473392.

The previous prime is 12766519. The next prime is 12766543. The reversal of 12766521 is 12566721.

12766521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12766521 - 2¹ = 12766519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12766561) 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, 8605 + ... + 9978.

It is an arithmetic number, because the mean of its divisors is an integer number (2137160).

Almost surely, 2^12766521 is an apocalyptic number.

It is an amenable number.

12766521 is a deficient number, since it is larger than the sum of its proper divisors (4330759).

12766521 is a wasteful number, since it uses less digits than its factorization.

12766521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18815.

The product of its digits is 5040, while the sum is 30.

The square root of 12766521 is about 3573.0268680770. The cubic root of 12766521 is about 233.7172968442.

The spelling of 12766521 in words is "twelve million, seven hundred sixty-six thousand, five hundred twenty-one".