203404234221 has 12 divisors (see below), whose sum is σ = 293815808572. Its totient is φ = 135598349376.

The previous prime is 203404234217. The next prime is 203404234237. The reversal of 203404234221 is 122432404302.

203404234221 is a `hidden beast` number, since 2 + 0 + 3 + 404 + 2 + 34 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 78697080900 + 124707153321 = 280530^2 + 353139^2 .

It is not a de Polignac number, because 203404234221 - 2² = 203404234217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203404234291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72046 + ... + 641871.

Almost surely, 2^203404234221 is an apocalyptic number.

It is an amenable number.

203404234221 is a deficient number, since it is larger than the sum of its proper divisors (90411574351).

203404234221 is a wasteful number, since it uses less digits than its factorization.

203404234221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745580 (or 745577 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 203404234221 its reverse (122432404302), we get a palindrome (325836638523).

The spelling of 203404234221 in words is "two hundred three billion, four hundred four million, two hundred thirty-four thousand, two hundred twenty-one".