12512421521 has 12 divisors (see below), whose sum is σ = 13367184768. Its totient is φ = 11690028504.

The previous prime is 12512421517. The next prime is 12512421527.

It is a happy number.

12512421521 is nontrivially palindromic in base 10.

12512421521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12512421521 - 2² = 12512421517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12512421527) 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 11 ways as a sum of consecutive naturals, for example, 104585 + ... + 189638.

It is an arithmetic number, because the mean of its divisors is an integer number (1113932064).

Almost surely, 2^12512421521 is an apocalyptic number.

It is an amenable number.

12512421521 is a deficient number, since it is larger than the sum of its proper divisors (854763247).

12512421521 is an equidigital number, since it uses as much as digits as its factorization.

12512421521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294332 (or 294289 counting only the distinct ones).

The product of its digits is 1600, while the sum is 26.

The spelling of 12512421521 in words is "twelve billion, five hundred twelve million, four hundred twenty-one thousand, five hundred twenty-one".