12512621521 has 2 divisors, whose sum is σ = 12512621522. Its totient is φ = 12512621520.

The previous prime is 12512621519. The next prime is 12512621573.

12512621521 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9127127296 + 3385494225 = 95536^2 + 58185^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 12512621521 - 2¹ = 12512621519 is a prime.

Together with 12512621519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12512621521.

It is not a weakly prime, because it can be changed into another prime (12512621581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6256310760 + 6256310761.

It is an arithmetic number, because the mean of its divisors is an integer number (6256310761).

Almost surely, 2^12512621521 is an apocalyptic number.

It is an amenable number.

12512621521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12512621521 is an equidigital number, since it uses as much as digits as its factorization.

12512621521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 28.

The spelling of 12512621521 in words is "twelve billion, five hundred twelve million, six hundred twenty-one thousand, five hundred twenty-one".