203310421 has 2 divisors, whose sum is σ = 203310422. Its totient is φ = 203310420.

The previous prime is 203310413. The next prime is 203310439. The reversal of 203310421 is 124013302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138909796 + 64400625 = 11786^2 + 8025^2 .

It is a cyclic number.

It is not a de Polignac number, because 203310421 - 2³ = 203310413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203310395 and 203310404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203310451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101655210 + 101655211.

It is an arithmetic number, because the mean of its divisors is an integer number (101655211).

Almost surely, 2^203310421 is an apocalyptic number.

It is an amenable number.

203310421 is a deficient number, since it is larger than the sum of its proper divisors (1).

203310421 is an equidigital number, since it uses as much as digits as its factorization.

203310421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 203310421 is about 14258.6963289075. The cubic root of 203310421 is about 588.0124839236.

Adding to 203310421 its reverse (124013302), we get a palindrome (327323723).

The spelling of 203310421 in words is "two hundred three million, three hundred ten thousand, four hundred twenty-one".