121311221232121 has 2 divisors, whose sum is σ = 121311221232122. Its totient is φ = 121311221232120.

The previous prime is 121311221232107. The next prime is 121311221232133. The reversal of 121311221232121 is 121232122113121.

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., 75314001716496 + 45997219515625 = 8678364^2 + 6782125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121311221232121 is a prime.

It is not a weakly prime, because it can be changed into another prime (121311221232181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60655610616060 + 60655610616061.

It is an arithmetic number, because the mean of its divisors is an integer number (60655610616061).

Almost surely, 2^{121311221232121} is an apocalyptic number.

It is an amenable number.

121311221232121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121311221232121 is an equidigital number, since it uses as much as digits as its factorization.

121311221232121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

Adding to 121311221232121 its reverse (121232122113121), we get a palindrome (242543343345242).

The spelling of 121311221232121 in words is "one hundred twenty-one trillion, three hundred eleven billion, two hundred twenty-one million, two hundred thirty-two thousand, one hundred twenty-one".