12515422121201 has 2 divisors, whose sum is σ = 12515422121202. Its totient is φ = 12515422121200.

The previous prime is 12515422121159. The next prime is 12515422121287. The reversal of 12515422121201 is 10212122451521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7962831778801 + 4552590342400 = 2821849^2 + 2133680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12515422121201 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12515422124201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6257711060600 + 6257711060601.

It is an arithmetic number, because the mean of its divisors is an integer number (6257711060601).

Almost surely, 2^{12515422121201} is an apocalyptic number.

It is an amenable number.

12515422121201 is a deficient number, since it is larger than the sum of its proper divisors (1).

12515422121201 is an equidigital number, since it uses as much as digits as its factorization.

12515422121201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 29.

Adding to 12515422121201 its reverse (10212122451521), we get a palindrome (22727544572722).

The spelling of 12515422121201 in words is "twelve trillion, five hundred fifteen billion, four hundred twenty-two million, one hundred twenty-one thousand, two hundred one".