16326538121 has 2 divisors, whose sum is σ = 16326538122. Its totient is φ = 16326538120.

The previous prime is 16326538061. The next prime is 16326538141. The reversal of 16326538121 is 12183562361.

It is a happy number.

16326538121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14312772496 + 2013765625 = 119636^2 + 44875^2 .

It is a cyclic number.

It is not a de Polignac number, because 16326538121 - 2¹⁴ = 16326521737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16326538141) 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, 8163269060 + 8163269061.

It is an arithmetic number, because the mean of its divisors is an integer number (8163269061).

Almost surely, 2^16326538121 is an apocalyptic number.

It is an amenable number.

16326538121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16326538121 is an equidigital number, since it uses as much as digits as its factorization.

16326538121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The spelling of 16326538121 in words is "sixteen billion, three hundred twenty-six million, five hundred thirty-eight thousand, one hundred twenty-one".