12521766841 has 4 divisors (see below), whose sum is σ = 12531558400. Its totient is φ = 12511975284.

The previous prime is 12521766833. The next prime is 12521766877. The reversal of 12521766841 is 14866712521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12521766841 - 2³ = 12521766833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521766641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4893861 + ... + 4896418.

It is an arithmetic number, because the mean of its divisors is an integer number (3132889600).

Almost surely, 2^12521766841 is an apocalyptic number.

It is an amenable number.

12521766841 is a deficient number, since it is larger than the sum of its proper divisors (9791559).

12521766841 is an equidigital number, since it uses as much as digits as its factorization.

12521766841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9791558.

The product of its digits is 161280, while the sum is 43.

The spelling of 12521766841 in words is "twelve billion, five hundred twenty-one million, seven hundred sixty-six thousand, eight hundred forty-one".