204137021 has 8 divisors (see below), whose sum is σ = 223003584. Its totient is φ = 185321920.

The previous prime is 204137009. The next prime is 204137047. The reversal of 204137021 is 120731402.

204137021 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 204137021 - 2¹⁸ = 203874877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204136984 and 204137002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204137321) 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, 4316 + ... + 20661.

It is an arithmetic number, because the mean of its divisors is an integer number (27875448).

Almost surely, 2^204137021 is an apocalyptic number.

It is an amenable number.

204137021 is a deficient number, since it is larger than the sum of its proper divisors (18866563).

204137021 is a wasteful number, since it uses less digits than its factorization.

204137021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25731.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 204137021 is about 14287.6527463401. The cubic root of 204137021 is about 588.8083012873.

Adding to 204137021 its reverse (120731402), we get a palindrome (324868423).

The spelling of 204137021 in words is "two hundred four million, one hundred thirty-seven thousand, twenty-one".