204421242431 has 16 divisors (see below), whose sum is σ = 234422260800. Its totient is φ = 174620275200.

The previous prime is 204421242419. The next prime is 204421242451. The reversal of 204421242431 is 134242124402.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-204421242431 is a prime.

It is a super-2 number, since 2×204421242431² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204421242394 and 204421242403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204421242451) 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 in 15 ways as a sum of consecutive naturals, for example, 4622135 + ... + 4666151.

It is an arithmetic number, because the mean of its divisors is an integer number (14651391300).

Almost surely, 2^204421242431 is an apocalyptic number.

204421242431 is a deficient number, since it is larger than the sum of its proper divisors (30001018369).

204421242431 is a wasteful number, since it uses less digits than its factorization.

204421242431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46274.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 204421242431 its reverse (134242124402), we get a palindrome (338663366833).

The spelling of 204421242431 in words is "two hundred four billion, four hundred twenty-one million, two hundred forty-two thousand, four hundred thirty-one".