203404322321 has 4 divisors (see below), whose sum is σ = 210418264500. Its totient is φ = 196390380144.

The previous prime is 203404322309. The next prime is 203404322323. The reversal of 203404322321 is 123223404302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88825457296 + 114578865025 = 298036^2 + 338495^2 .

It is a cyclic number.

It is not a de Polignac number, because 203404322321 - 2¹⁰ = 203404321297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203404322323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506971046 + ... + 3506971103.

It is an arithmetic number, because the mean of its divisors is an integer number (52604566125).

Almost surely, 2^203404322321 is an apocalyptic number.

It is an amenable number.

203404322321 is a deficient number, since it is larger than the sum of its proper divisors (7013942179).

203404322321 is an equidigital number, since it uses as much as digits as its factorization.

203404322321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013942178.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 203404322321 its reverse (123223404302), we get a palindrome (326627726623).

The spelling of 203404322321 in words is "two hundred three billion, four hundred four million, three hundred twenty-two thousand, three hundred twenty-one".