204103021 has 4 divisors (see below), whose sum is σ = 205230844. Its totient is φ = 202975200.

The previous prime is 204102967. The next prime is 204103027. The reversal of 204103021 is 120301402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2604996 + 201498025 = 1614^2 + 14195^2 .

It is a cyclic number.

It is not a de Polignac number, because 204103021 - 2²⁵ = 170548589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204102992 and 204103010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204103027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563640 + ... + 564001.

It is an arithmetic number, because the mean of its divisors is an integer number (51307711).

Almost surely, 2^204103021 is an apocalyptic number.

It is an amenable number.

204103021 is a deficient number, since it is larger than the sum of its proper divisors (1127823).

204103021 is a wasteful number, since it uses less digits than its factorization.

204103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127822.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 204103021 is about 14286.4628582445. The cubic root of 204103021 is about 588.7756098566.

Adding to 204103021 its reverse (120301402), we get a palindrome (324404423).

The spelling of 204103021 in words is "two hundred four million, one hundred three thousand, twenty-one".