203311424221 has 2 divisors, whose sum is σ = 203311424222. Its totient is φ = 203311424220.

The previous prime is 203311424207. The next prime is 203311424273. The reversal of 203311424221 is 122424113302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201613572196 + 1697852025 = 449014^2 + 41205^2 .

It is a cyclic number.

It is not a de Polignac number, because 203311424221 - 2⁵ = 203311424189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203311424291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101655712110 + 101655712111.

It is an arithmetic number, because the mean of its divisors is an integer number (101655712111).

Almost surely, 2^203311424221 is an apocalyptic number.

It is an amenable number.

203311424221 is a deficient number, since it is larger than the sum of its proper divisors (1).

203311424221 is an equidigital number, since it uses as much as digits as its factorization.

203311424221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 203311424221 its reverse (122424113302), we get a palindrome (325735537523).

The spelling of 203311424221 in words is "two hundred three billion, three hundred eleven million, four hundred twenty-four thousand, two hundred twenty-one".