204243204331 has 4 divisors (see below), whose sum is σ = 204299738032. Its totient is φ = 204186670632.

The previous prime is 204243204317. The next prime is 204243204349. The reversal of 204243204331 is 133402342402.

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

It is a cyclic number.

It is not a de Polignac number, because 204243204331 - 2¹¹ = 204243202283 is a prime.

It is a super-2 number, since 2×204243204331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204243204331.

It is not an unprimeable number, because it can be changed into a prime (204243204301) 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, 28261431 + ... + 28268656.

It is an arithmetic number, because the mean of its divisors is an integer number (51074934508).

Almost surely, 2^204243204331 is an apocalyptic number.

204243204331 is a deficient number, since it is larger than the sum of its proper divisors (56533701).

204243204331 is an equidigital number, since it uses as much as digits as its factorization.

204243204331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56533700.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 204243204331 its reverse (133402342402), we get a palindrome (337645546733).

The spelling of 204243204331 in words is "two hundred four billion, two hundred forty-three million, two hundred four thousand, three hundred thirty-one".