204432421321 has 2 divisors, whose sum is σ = 204432421322. Its totient is φ = 204432421320.

The previous prime is 204432421307. The next prime is 204432421499. The reversal of 204432421321 is 123124234402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204359147721 + 73273600 = 452061^2 + 8560^2 .

It is a cyclic number.

It is not a de Polignac number, because 204432421321 - 2³³ = 195842486729 is a prime.

It is a super-2 number, since 2×204432421321² (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 204432421321.

It is not a weakly prime, because it can be changed into another prime (204432422321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102216210660 + 102216210661.

It is an arithmetic number, because the mean of its divisors is an integer number (102216210661).

Almost surely, 2^204432421321 is an apocalyptic number.

It is an amenable number.

204432421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

204432421321 is an equidigital number, since it uses as much as digits as its factorization.

204432421321 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 204432421321 its reverse (123124234402), we get a palindrome (327556655723).

The spelling of 204432421321 in words is "two hundred four billion, four hundred thirty-two million, four hundred twenty-one thousand, three hundred twenty-one".