12436260521 has 4 divisors (see below), whose sum is σ = 12444614100. Its totient is φ = 12427906944.

The previous prime is 12436260469. The next prime is 12436260547. The reversal of 12436260521 is 12506263421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12506263421 = 73 ⋅171318677.

It can be written as a sum of positive squares in 2 ways, for example, as 7009875625 + 5426384896 = 83725^2 + 73664^2 .

It is a cyclic number.

It is not a de Polignac number, because 12436260521 - 2⁶ = 12436260457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12436260721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4174556 + ... + 4177533.

It is an arithmetic number, because the mean of its divisors is an integer number (3111153525).

Almost surely, 2^12436260521 is an apocalyptic number.

It is an amenable number.

12436260521 is a deficient number, since it is larger than the sum of its proper divisors (8353579).

12436260521 is an equidigital number, since it uses as much as digits as its factorization.

12436260521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8353578.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 12436260521 in words is "twelve billion, four hundred thirty-six million, two hundred sixty thousand, five hundred twenty-one".