203121323320243 has 8 divisors (see below), whose sum is σ = 210125822104800. Its totient is φ = 196116845550528.

The previous prime is 203121323320187. The next prime is 203121323320297. The reversal of 203121323320243 is 342023323121302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 203121323320243 - 2²⁵ = 203121289765811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203121323320843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15847330 + ... + 25639432.

It is an arithmetic number, because the mean of its divisors is an integer number (26265727763100).

Almost surely, 2^{203121323320243} is an apocalyptic number.

203121323320243 is a deficient number, since it is larger than the sum of its proper divisors (7004498784557).

203121323320243 is an equidigital number, since it uses as much as digits as its factorization.

203121323320243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10507421.

The product of its (nonzero) digits is 31104, while the sum is 31.

Adding to 203121323320243 its reverse (342023323121302), we get a palindrome (545144646441545).

The spelling of 203121323320243 in words is "two hundred three trillion, one hundred twenty-one billion, three hundred twenty-three million, three hundred twenty thousand, two hundred forty-three".