203320021031 has 4 divisors (see below), whose sum is σ = 203322799152. Its totient is φ = 203317242912.

The previous prime is 203320021013. The next prime is 203320021033. The reversal of 203320021031 is 130120023302.

203320021031 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 a de Polignac number, because none of the positive numbers 2^k-203320021031 is a prime.

It is a super-2 number, since 2×203320021031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203320021033) 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, 1276226 + ... + 1426671.

It is an arithmetic number, because the mean of its divisors is an integer number (50830699788).

Almost surely, 2^203320021031 is an apocalyptic number.

203320021031 is a deficient number, since it is larger than the sum of its proper divisors (2778121).

203320021031 is an equidigital number, since it uses as much as digits as its factorization.

203320021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778120.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 203320021031 its reverse (130120023302), we get a palindrome (333440044333).

The spelling of 203320021031 in words is "two hundred three billion, three hundred twenty million, twenty-one thousand, thirty-one".