12521462521 has 2 divisors, whose sum is σ = 12521462522. Its totient is φ = 12521462520.

The previous prime is 12521462509. The next prime is 12521462563. The reversal of 12521462521 is 12526412521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7737665296 + 4783797225 = 87964^2 + 69165^2 .

It is a cyclic number.

It is not a de Polignac number, because 12521462521 - 2²³ = 12513073913 is a prime.

It is not a weakly prime, because it can be changed into another prime (12521465521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260731260 + 6260731261.

It is an arithmetic number, because the mean of its divisors is an integer number (6260731261).

Almost surely, 2^12521462521 is an apocalyptic number.

It is an amenable number.

12521462521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521462521 is an equidigital number, since it uses as much as digits as its factorization.

12521462521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 31.

The spelling of 12521462521 in words is "twelve billion, five hundred twenty-one million, four hundred sixty-two thousand, five hundred twenty-one".