12524456521 has 4 divisors (see below), whose sum is σ = 12526643844. Its totient is φ = 12522269200.

The previous prime is 12524456513. The next prime is 12524456531. The reversal of 12524456521 is 12565442521.

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 9112611600 + 3411844921 = 95460^2 + 58411^2 .

It is not a de Polignac number, because 12524456521 - 2³ = 12524456513 is a prime.

It is a super-2 number, since 2×12524456521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12524456531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085050 + ... + 1096531.

It is an arithmetic number, because the mean of its divisors is an integer number (3131660961).

Almost surely, 2^12524456521 is an apocalyptic number.

It is an amenable number.

12524456521 is a deficient number, since it is larger than the sum of its proper divisors (2187323).

12524456521 is an equidigital number, since it uses as much as digits as its factorization.

12524456521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187322.

The product of its digits is 96000, while the sum is 37.

The spelling of 12524456521 in words is "twelve billion, five hundred twenty-four million, four hundred fifty-six thousand, five hundred twenty-one".