204431211242381 has 2 divisors, whose sum is σ = 204431211242382. Its totient is φ = 204431211242380.

The previous prime is 204431211242299. The next prime is 204431211242387. The reversal of 204431211242381 is 183242112134402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186350729269156 + 18080481973225 = 13651034^2 + 4252115^2 .

It is a cyclic number.

It is not a de Polignac number, because 204431211242381 - 2¹⁰ = 204431211241357 is a prime.

It is a super-2 number, since 2×204431211242381² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204431211242387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102215605621190 + 102215605621191.

It is an arithmetic number, because the mean of its divisors is an integer number (102215605621191).

Almost surely, 2^{204431211242381} is an apocalyptic number.

It is an amenable number.

204431211242381 is a deficient number, since it is larger than the sum of its proper divisors (1).

204431211242381 is an equidigital number, since it uses as much as digits as its factorization.

204431211242381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 38.

Adding to 204431211242381 its reverse (183242112134402), we get a palindrome (387673323376783).

The spelling of 204431211242381 in words is "two hundred four trillion, four hundred thirty-one billion, two hundred eleven million, two hundred forty-two thousand, three hundred eighty-one".