12547074521 has 2 divisors, whose sum is σ = 12547074522. Its totient is φ = 12547074520.

The previous prime is 12547074511. The next prime is 12547074583.

It is a happy number.

12547074521 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., 7069446400 + 5477628121 = 84080^2 + 74011^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 12547074521 - 2²⁶ = 12479965657 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 (12547074511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6273537260 + 6273537261.

It is an arithmetic number, because the mean of its divisors is an integer number (6273537261).

Almost surely, 2^12547074521 is an apocalyptic number.

It is an amenable number.

12547074521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12547074521 is an equidigital number, since it uses as much as digits as its factorization.

12547074521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78400, while the sum is 38.

It can be divided in two parts, 125470 and 74521, that added together give a palindrome (199991).

The spelling of 12547074521 in words is "twelve billion, five hundred forty-seven million, seventy-four thousand, five hundred twenty-one".