204131021 has 8 divisors (see below), whose sum is σ = 205769088. Its totient is φ = 202500000.

The previous prime is 204131017. The next prime is 204131047. The reversal of 204131021 is 120131402.

204131021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204131021 - 2² = 204131017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204130987 and 204131005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204131051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66521 + ... + 69521.

It is an arithmetic number, because the mean of its divisors is an integer number (25721136).

Almost surely, 2^204131021 is an apocalyptic number.

It is an amenable number.

204131021 is a deficient number, since it is larger than the sum of its proper divisors (1638067).

204131021 is a wasteful number, since it uses less digits than its factorization.

204131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3523.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 204131021 is about 14287.4427732887. The cubic root of 204131021 is about 588.8025324750.

Adding to 204131021 its reverse (120131402), we get a palindrome (324262423).

The spelling of 204131021 in words is "two hundred four million, one hundred thirty-one thousand, twenty-one".