204021231 has 16 divisors (see below), whose sum is σ = 276859008. Its totient is φ = 133610400.

The previous prime is 204021229. The next prime is 204021241. The reversal of 204021231 is 132120402.

It is not a de Polignac number, because 204021231 - 2¹ = 204021229 is a prime.

It is a super-2 number, since 2×204021231² = 83249325397510722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204021231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204021211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83416 + ... + 85826.

It is an arithmetic number, because the mean of its divisors is an integer number (17303688).

Almost surely, 2^204021231 is an apocalyptic number.

204021231 is a deficient number, since it is larger than the sum of its proper divisors (72837777).

204021231 is a wasteful number, since it uses less digits than its factorization.

204021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 204021231 is about 14283.6000714106. The cubic root of 204021231 is about 588.6969528614.

Adding to 204021231 its reverse (132120402), we get a palindrome (336141633).

The spelling of 204021231 in words is "two hundred four million, twenty-one thousand, two hundred thirty-one".