203403402344321 has 2 divisors, whose sum is σ = 203403402344322. Its totient is φ = 203403402344320.

The previous prime is 203403402344279. The next prime is 203403402344353. The reversal of 203403402344321 is 123443204304302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169160588130625 + 34242814213696 = 13006175^2 + 5851736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203403402344321 is a prime.

It is not a weakly prime, because it can be changed into another prime (203403402344371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101701701172160 + 101701701172161.

It is an arithmetic number, because the mean of its divisors is an integer number (101701701172161).

Almost surely, 2^{203403402344321} is an apocalyptic number.

It is an amenable number.

203403402344321 is a deficient number, since it is larger than the sum of its proper divisors (1).

203403402344321 is an equidigital number, since it uses as much as digits as its factorization.

203403402344321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 35.

Adding to 203403402344321 its reverse (123443204304302), we get a palindrome (326846606648623).

The spelling of 203403402344321 in words is "two hundred three trillion, four hundred three billion, four hundred two million, three hundred forty-four thousand, three hundred twenty-one".