203121323321 has 16 divisors (see below), whose sum is σ = 236907542400. Its totient is φ = 174080939760.

The previous prime is 203121323267. The next prime is 203121323341. The reversal of 203121323321 is 123323121302.

It is not a de Polignac number, because 203121323321 - 2⁶ = 203121323257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203121323341) 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 in 15 ways as a sum of consecutive naturals, for example, 2869211 + ... + 2939151.

It is an arithmetic number, because the mean of its divisors is an integer number (14806721400).

Almost surely, 2^203121323321 is an apocalyptic number.

It is an amenable number.

203121323321 is a deficient number, since it is larger than the sum of its proper divisors (33786219079).

203121323321 is an frugal number, since it uses more digits than its factorization.

203121323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78429 (or 78415 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 203121323321 its reverse (123323121302), we get a palindrome (326444444623).

The spelling of 203121323321 in words is "two hundred three billion, one hundred twenty-one million, three hundred twenty-three thousand, three hundred twenty-one".