204431433310421 has 2 divisors, whose sum is σ = 204431433310422. Its totient is φ = 204431433310420.

The previous prime is 204431433310399. The next prime is 204431433310427. The reversal of 204431433310421 is 124013334134402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198412973215396 + 6018460095025 = 14085914^2 + 2453255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204431433310421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204431433310427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102215716655210 + 102215716655211.

It is an arithmetic number, because the mean of its divisors is an integer number (102215716655211).

Almost surely, 2^{204431433310421} is an apocalyptic number.

It is an amenable number.

204431433310421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204431433310421 is an equidigital number, since it uses as much as digits as its factorization.

204431433310421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 204431433310421 its reverse (124013334134402), we get a palindrome (328444767444823).

The spelling of 204431433310421 in words is "two hundred four trillion, four hundred thirty-one billion, four hundred thirty-three million, three hundred ten thousand, four hundred twenty-one".