203425205521 has 2 divisors, whose sum is σ = 203425205522. Its totient is φ = 203425205520.

The previous prime is 203425205491. The next prime is 203425205527. The reversal of 203425205521 is 125502524302.

203425205521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155207633296 + 48217572225 = 393964^2 + 219585^2 .

It is a cyclic number.

It is not a de Polignac number, because 203425205521 - 2¹³ = 203425197329 is a prime.

It is a super-2 number, since 2×203425205521² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (203425205527) 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, 101712602760 + 101712602761.

It is an arithmetic number, because the mean of its divisors is an integer number (101712602761).

Almost surely, 2^203425205521 is an apocalyptic number.

It is an amenable number.

203425205521 is a deficient number, since it is larger than the sum of its proper divisors (1).

203425205521 is an equidigital number, since it uses as much as digits as its factorization.

203425205521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 203425205521 its reverse (125502524302), we get a palindrome (328927729823).

The spelling of 203425205521 in words is "two hundred three billion, four hundred twenty-five million, two hundred five thousand, five hundred twenty-one".