12521412521 has 2 divisors, whose sum is σ = 12521412522. Its totient is φ = 12521412520.

The previous prime is 12521412499. The next prime is 12521412539.

It is a happy number.

12521412521 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9409000000 + 3112412521 = 97000^2 + 55789^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 12521412521 - 2²⁶ = 12454303657 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (12521462521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260706260 + 6260706261.

It is an arithmetic number, because the mean of its divisors is an integer number (6260706261).

Almost surely, 2^12521412521 is an apocalyptic number.

It is an amenable number.

12521412521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521412521 is an equidigital number, since it uses as much as digits as its factorization.

12521412521 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 12521412521 in words is "twelve billion, five hundred twenty-one million, four hundred twelve thousand, five hundred twenty-one".