203021321023 has 4 divisors (see below), whose sum is σ = 203907877240. Its totient is φ = 202134764808.

The previous prime is 203021320951. The next prime is 203021321077. The reversal of 203021321023 is 320123120302.

203021321023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 203021321023 - 2⁹ = 203021320511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203021321123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443277765 + ... + 443278222.

It is an arithmetic number, because the mean of its divisors is an integer number (50976969310).

Almost surely, 2^203021321023 is an apocalyptic number.

203021321023 is a deficient number, since it is larger than the sum of its proper divisors (886556217).

203021321023 is an equidigital number, since it uses as much as digits as its factorization.

203021321023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886556216.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 203021321023 its reverse (320123120302), we get a palindrome (523144441325).

The spelling of 203021321023 in words is "two hundred three billion, twenty-one million, three hundred twenty-one thousand, twenty-three".