13420120121 has 2 divisors, whose sum is σ = 13420120122. Its totient is φ = 13420120120.

The previous prime is 13420120073. The next prime is 13420120139. The reversal of 13420120121 is 12102102431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12959545600 + 460574521 = 113840^2 + 21461^2 .

It is a cyclic number.

It is not a de Polignac number, because 13420120121 - 2⁶ = 13420120057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13420120121.

It is not a weakly prime, because it can be changed into another prime (13420120151) 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, 6710060060 + 6710060061.

It is an arithmetic number, because the mean of its divisors is an integer number (6710060061).

Almost surely, 2^13420120121 is an apocalyptic number.

It is an amenable number.

13420120121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13420120121 is an equidigital number, since it uses as much as digits as its factorization.

13420120121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 13420120121 its reverse (12102102431), we get a palindrome (25522222552).

The spelling of 13420120121 in words is "thirteen billion, four hundred twenty million, one hundred twenty thousand, one hundred twenty-one".