203401021 has 2 divisors, whose sum is σ = 203401022. Its totient is φ = 203401020.

The previous prime is 203400997. The next prime is 203401027. The reversal of 203401021 is 120104302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188073796 + 15327225 = 13714^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 203401021 - 2¹¹ = 203398973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203400992 and 203401010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203401027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101700510 + 101700511.

It is an arithmetic number, because the mean of its divisors is an integer number (101700511).

Almost surely, 2^203401021 is an apocalyptic number.

It is an amenable number.

203401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203401021 is an equidigital number, since it uses as much as digits as its factorization.

203401021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 203401021 is about 14261.8729835881. The cubic root of 203401021 is about 588.0998151081.

Adding to 203401021 its reverse (120104302), we get a palindrome (323505323).

The spelling of 203401021 in words is "two hundred three million, four hundred one thousand, twenty-one".