204221234431 has 2 divisors, whose sum is σ = 204221234432. Its totient is φ = 204221234430.

The previous prime is 204221234389. The next prime is 204221234489. The reversal of 204221234431 is 134432122402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204221234431 is a prime.

It is a super-2 number, since 2×204221234431² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204221234431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204221234491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102110617215 + 102110617216.

It is an arithmetic number, because the mean of its divisors is an integer number (102110617216).

Almost surely, 2^204221234431 is an apocalyptic number.

204221234431 is a deficient number, since it is larger than the sum of its proper divisors (1).

204221234431 is an equidigital number, since it uses as much as digits as its factorization.

204221234431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 204221234431 its reverse (134432122402), we get a palindrome (338653356833).

The spelling of 204221234431 in words is "two hundred four billion, two hundred twenty-one million, two hundred thirty-four thousand, four hundred thirty-one".