203321311013 has 2 divisors, whose sum is σ = 203321311014. Its totient is φ = 203321311012.

The previous prime is 203321311001. The next prime is 203321311043. The reversal of 203321311013 is 310113123302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139313323009 + 64007988004 = 373247^2 + 252998^2 .

It is a cyclic number.

It is not a de Polignac number, because 203321311013 - 2²⁶ = 203254202149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203321311043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101660655506 + 101660655507.

It is an arithmetic number, because the mean of its divisors is an integer number (101660655507).

Almost surely, 2^203321311013 is an apocalyptic number.

It is an amenable number.

203321311013 is a deficient number, since it is larger than the sum of its proper divisors (1).

203321311013 is an equidigital number, since it uses as much as digits as its factorization.

203321311013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 203321311013 its reverse (310113123302), we get a palindrome (513434434315).

The spelling of 203321311013 in words is "two hundred three billion, three hundred twenty-one million, three hundred eleven thousand, thirteen".