204313431242421 has 12 divisors (see below), whose sum is σ = 295126311243660. Its totient is φ = 136205764672320.

The previous prime is 204313431242383. The next prime is 204313431242443. The reversal of 204313431242421 is 124242134313402.

204313431242421 is a `hidden beast` number, since 2 + 0 + 4 + 31 + 343 + 1 + 242 + 42 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15780072987396 + 188533358255025 = 3972414^2 + 13730745^2 .

It is not a de Polignac number, because 204313431242421 - 2⁷ = 204313431242293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204313431244421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265385040 + ... + 266153801.

It is an arithmetic number, because the mean of its divisors is an integer number (24593859270305).

Almost surely, 2^{204313431242421} is an apocalyptic number.

It is an amenable number.

204313431242421 is a deficient number, since it is larger than the sum of its proper divisors (90812880001239).

204313431242421 is a wasteful number, since it uses less digits than its factorization.

204313431242421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531581556 (or 531581553 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

Adding to 204313431242421 its reverse (124242134313402), we get a palindrome (328555565555823).

The spelling of 204313431242421 in words is "two hundred four trillion, three hundred thirteen billion, four hundred thirty-one million, two hundred forty-two thousand, four hundred twenty-one".