12504240521 has 4 divisors (see below), whose sum is σ = 12504639252. Its totient is φ = 12503841792.

The previous prime is 12504240487. The next prime is 12504240533.

12504240521 is nontrivially palindromic in base 10.

12504240521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1323504400 + 11180736121 = 36380^2 + 105739^2 .

It is a cyclic number.

It is not a de Polignac number, because 12504240521 - 2⁶ = 12504240457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12504240821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147896 + ... + 216521.

It is an arithmetic number, because the mean of its divisors is an integer number (3126159813).

Almost surely, 2^12504240521 is an apocalyptic number.

It is an amenable number.

12504240521 is a deficient number, since it is larger than the sum of its proper divisors (398731).

12504240521 is an equidigital number, since it uses as much as digits as its factorization.

12504240521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398730.

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 12504240521 in words is "twelve billion, five hundred four million, two hundred forty thousand, five hundred twenty-one".