12521310121 has 2 divisors, whose sum is σ = 12521310122. Its totient is φ = 12521310120.

The previous prime is 12521310089. The next prime is 12521310127. The reversal of 12521310121 is 12101312521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10859932521 + 1661377600 = 104211^2 + 40760^2 .

It is a cyclic number.

It is not a de Polignac number, because 12521310121 - 2⁵ = 12521310089 is a prime.

It is not a weakly prime, because it can be changed into another prime (12521310127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260655060 + 6260655061.

It is an arithmetic number, because the mean of its divisors is an integer number (6260655061).

Almost surely, 2^12521310121 is an apocalyptic number.

It is an amenable number.

12521310121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521310121 is an equidigital number, since it uses as much as digits as its factorization.

12521310121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 12521310121 its reverse (12101312521), we get a palindrome (24622622642).

The spelling of 12521310121 in words is "twelve billion, five hundred twenty-one million, three hundred ten thousand, one hundred twenty-one".