13121202121 has 2 divisors, whose sum is σ = 13121202122. Its totient is φ = 13121202120.

The previous prime is 13121202119. The next prime is 13121202137. The reversal of 13121202121 is 12120212131.

13121202121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (13121202137) can be obtained adding 13121202121 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12148448400 + 972753721 = 110220^2 + 31189^2 .

It is a cyclic number.

It is not a de Polignac number, because 13121202121 - 2¹ = 13121202119 is a prime.

Together with 13121202119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13121202095 and 13121202104.

It is not a weakly prime, because it can be changed into another prime (13121202151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560601060 + 6560601061.

It is an arithmetic number, because the mean of its divisors is an integer number (6560601061).

Almost surely, 2^13121202121 is an apocalyptic number.

It is an amenable number.

13121202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121202121 is an equidigital number, since it uses as much as digits as its factorization.

13121202121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 13121202121 its reverse (12120212131), we get a palindrome (25241414252).

The spelling of 13121202121 in words is "thirteen billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty-one".