204311421 has 12 divisors (see below), whose sum is σ = 304636800. Its totient is φ = 131813640.

The previous prime is 204311417. The next prime is 204311431. The reversal of 204311421 is 124113402.

It is not a de Polignac number, because 204311421 - 2² = 204311417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 204311394 and 204311403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204311431) 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, 365871 + ... + 366428.

It is an arithmetic number, because the mean of its divisors is an integer number (25386400).

Almost surely, 2^204311421 is an apocalyptic number.

It is an amenable number.

204311421 is a deficient number, since it is larger than the sum of its proper divisors (100325379).

204311421 is a wasteful number, since it uses less digits than its factorization.

204311421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732336 (or 732333 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 204311421 is about 14293.7546152157. The cubic root of 204311421 is about 588.9759320580.

Adding to 204311421 its reverse (124113402), we get a palindrome (328424823).

The spelling of 204311421 in words is "two hundred four million, three hundred eleven thousand, four hundred twenty-one".