204203021 has 16 divisors (see below), whose sum is σ = 225944640. Its totient is φ = 183012480.

The previous prime is 204203003. The next prime is 204203023. The reversal of 204203021 is 120302402.

It is a cyclic number.

It is not a de Polignac number, because 204203021 - 2²⁶ = 137094157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204202987 and 204203005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204203023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269375 + ... + 270131.

It is an arithmetic number, because the mean of its divisors is an integer number (14121540).

Almost surely, 2^204203021 is an apocalyptic number.

It is an amenable number.

204203021 is a deficient number, since it is larger than the sum of its proper divisors (21741619).

204203021 is a wasteful number, since it uses less digits than its factorization.

204203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 204203021 is about 14289.9622462762. The cubic root of 204203021 is about 588.8717507624.

Adding to 204203021 its reverse (120302402), we get a palindrome (324505423).

The spelling of 204203021 in words is "two hundred four million, two hundred three thousand, twenty-one".