203010020021 has 2 divisors, whose sum is σ = 203010020022. Its totient is φ = 203010020020.

The previous prime is 203010020009. The next prime is 203010020117. The reversal of 203010020021 is 120020010302.

It is a happy number.

203010020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202692645796 + 317374225 = 450214^2 + 17815^2 .

It is a cyclic number.

It is not a de Polignac number, because 203010020021 - 2⁶ = 203010019957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203010019984 and 203010020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203010028021) 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 as a sum of consecutive naturals, namely, 101505010010 + 101505010011.

It is an arithmetic number, because the mean of its divisors is an integer number (101505010011).

Almost surely, 2^203010020021 is an apocalyptic number.

It is an amenable number.

203010020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203010020021 is an equidigital number, since it uses as much as digits as its factorization.

203010020021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 203010020021 its reverse (120020010302), we get a palindrome (323030030323).

The spelling of 203010020021 in words is "two hundred three billion, ten million, twenty thousand, twenty-one".