204203421 has 12 divisors (see below), whose sum is σ = 295669920. Its totient is φ = 135808200.

The previous prime is 204203399. The next prime is 204203423. The reversal of 204203421 is 124302402.

It is not a de Polignac number, because 204203421 - 2⁶ = 204203357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204203394 and 204203403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204203423) 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, 23305 + ... + 30846.

It is an arithmetic number, because the mean of its divisors is an integer number (24639160).

Almost surely, 2^204203421 is an apocalyptic number.

It is an amenable number.

204203421 is a deficient number, since it is larger than the sum of its proper divisors (91466499).

204203421 is a wasteful number, since it uses less digits than its factorization.

204203421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54576 (or 54573 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 204203421 is about 14289.9762421076. The cubic root of 204203421 is about 588.8721352630.

Adding to 204203421 its reverse (124302402), we get a palindrome (328505823).

The spelling of 204203421 in words is "two hundred four million, two hundred three thousand, four hundred twenty-one".