204240430010421 has 36 divisors (see below), whose sum is σ = 343180893779724. Its totient is φ = 116708342486400.

The previous prime is 204240430010401. The next prime is 204240430010431. The reversal of 204240430010421 is 124010034042402.

204240430010421 is a `hidden beast` number, since 204 + 2 + 4 + 0 + 4 + 30 + 0 + 1 + 0 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 59998192222500 + 144242237787921 = 7745850^2 + 12010089^2 .

It is not a de Polignac number, because 204240430010421 - 2³⁷ = 204102991056949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204240430010401) 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 35 ways as a sum of consecutive naturals, for example, 127429191 + ... + 129022011.

Almost surely, 2^{204240430010421} is an apocalyptic number.

204240430010421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204240430010421 is a deficient number, since it is larger than the sum of its proper divisors (138940463769303).

204240430010421 is a wasteful number, since it uses less digits than its factorization.

204240430010421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883602 (or 1883592 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 204240430010421 its reverse (124010034042402), we get a palindrome (328250464052823).

The spelling of 204240430010421 in words is "two hundred four trillion, two hundred forty billion, four hundred thirty million, ten thousand, four hundred twenty-one".