12513741521 has 4 divisors (see below), whose sum is σ = 12553978944. Its totient is φ = 12473504100.

The previous prime is 12513741509. The next prime is 12513741553. The reversal of 12513741521 is 12514731521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12514731521 = 23869 ⋅524309.

It is a cyclic number.

It is not a de Polignac number, because 12513741521 - 2²⁶ = 12446632657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12513741571) 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, 20118245 + ... + 20118866.

It is an arithmetic number, because the mean of its divisors is an integer number (3138494736).

Almost surely, 2^12513741521 is an apocalyptic number.

It is an amenable number.

12513741521 is a deficient number, since it is larger than the sum of its proper divisors (40237423).

12513741521 is an equidigital number, since it uses as much as digits as its factorization.

12513741521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40237422.

The product of its digits is 8400, while the sum is 32.

The spelling of 12513741521 in words is "twelve billion, five hundred thirteen million, seven hundred forty-one thousand, five hundred twenty-one".