203404331421 has 6 divisors (see below), whose sum is σ = 293806256510. Its totient is φ = 135602887608.

The previous prime is 203404331401. The next prime is 203404331437. The reversal of 203404331421 is 124133404302.

203404331421 is a `hidden beast` number, since 2 + 0 + 340 + 4 + 3 + 314 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 165273958521 + 38130372900 = 406539^2 + 195270^2 .

It is not a de Polignac number, because 203404331421 - 2¹³ = 203404323229 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 (203404331401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11300240626 + ... + 11300240643.

Almost surely, 2^203404331421 is an apocalyptic number.

It is an amenable number.

203404331421 is a deficient number, since it is larger than the sum of its proper divisors (90401925089).

203404331421 is a wasteful number, since it uses less digits than its factorization.

203404331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22600481275 (or 22600481272 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 203404331421 its reverse (124133404302), we get a palindrome (327537735723).

The spelling of 203404331421 in words is "two hundred three billion, four hundred four million, three hundred thirty-one thousand, four hundred twenty-one".