203201321321 has 2 divisors, whose sum is σ = 203201321322. Its totient is φ = 203201321320.

The previous prime is 203201321287. The next prime is 203201321327. The reversal of 203201321321 is 123123102302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169361879296 + 33839442025 = 411536^2 + 183955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203201321321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 203201321293 and 203201321302.

It is not a weakly prime, because it can be changed into another prime (203201321327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101600660660 + 101600660661.

It is an arithmetic number, because the mean of its divisors is an integer number (101600660661).

Almost surely, 2^203201321321 is an apocalyptic number.

It is an amenable number.

203201321321 is a deficient number, since it is larger than the sum of its proper divisors (1).

203201321321 is an equidigital number, since it uses as much as digits as its factorization.

203201321321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 203201321321 its reverse (123123102302), we get a palindrome (326324423623).

The spelling of 203201321321 in words is "two hundred three billion, two hundred one million, three hundred twenty-one thousand, three hundred twenty-one".