13121220210121 has 2 divisors, whose sum is σ = 13121220210122. Its totient is φ = 13121220210120.

The previous prime is 13121220209957. The next prime is 13121220210151. The reversal of 13121220210121 is 12101202212131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13103495015625 + 17725194496 = 3619875^2 + 133136^2 .

It is a cyclic number.

It is not a de Polignac number, because 13121220210121 - 2³⁹ = 12571464396233 is a prime.

It is not a weakly prime, because it can be changed into another prime (13121220210151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560610105060 + 6560610105061.

It is an arithmetic number, because the mean of its divisors is an integer number (6560610105061).

Almost surely, 2^{13121220210121} is an apocalyptic number.

It is an amenable number.

13121220210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121220210121 is an equidigital number, since it uses as much as digits as its factorization.

13121220210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 13121220210121 its reverse (12101202212131), we get a palindrome (25222422422252).

The spelling of 13121220210121 in words is "thirteen trillion, one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-one".