203303111100021 has 12 divisors (see below), whose sum is σ = 293661808793548. Its totient is φ = 135534595356864.

The previous prime is 203303111099987. The next prime is 203303111100149. The reversal of 203303111100021 is 120001111303302.

203303111100021 is a `hidden beast` number, since 2 + 0 + 330 + 311 + 1 + 1 + 0 + 0 + 0 + 21 = 666.

203303111100021 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149081316132996 + 54221794967025 = 12209886^2 + 7363545^2 .

It is not a de Polignac number, because 203303111100021 - 2³³ = 203294521165429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203303111099967 and 203303111100003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203303111100721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66082690 + ... + 69090723.

Almost surely, 2^{203303111100021} is an apocalyptic number.

It is an amenable number.

203303111100021 is a deficient number, since it is larger than the sum of its proper divisors (90358697693527).

203303111100021 is a wasteful number, since it uses less digits than its factorization.

203303111100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135340532 (or 135340529 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 203303111100021 its reverse (120001111303302), we get a palindrome (323304222403323).

The spelling of 203303111100021 in words is "two hundred three trillion, three hundred three billion, one hundred eleven million, one hundred thousand, twenty-one".