12515044121 has 2 divisors, whose sum is σ = 12515044122. Its totient is φ = 12515044120.

The previous prime is 12515044067. The next prime is 12515044123. The reversal of 12515044121 is 12144051521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10071126025 + 2443918096 = 100355^2 + 49436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12515044121 is a prime.

Together with 12515044123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12515044123) 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, 6257522060 + 6257522061.

It is an arithmetic number, because the mean of its divisors is an integer number (6257522061).

Almost surely, 2^12515044121 is an apocalyptic number.

It is an amenable number.

12515044121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12515044121 is an equidigital number, since it uses as much as digits as its factorization.

12515044121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12515044121 its reverse (12144051521), we get a palindrome (24659095642).

The spelling of 12515044121 in words is "twelve billion, five hundred fifteen million, forty-four thousand, one hundred twenty-one".