204430421523 has 8 divisors (see below), whose sum is σ = 274534859200. Its totient is φ = 135306465768.

The previous prime is 204430421497. The next prime is 204430421561. The reversal of 204430421523 is 325124034402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204430421523 - 2¹³ = 204430413331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204430422523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245119993 + ... + 245120826.

It is an arithmetic number, because the mean of its divisors is an integer number (34316857400).

Almost surely, 2^204430421523 is an apocalyptic number.

204430421523 is a deficient number, since it is larger than the sum of its proper divisors (70104437677).

204430421523 is a wasteful number, since it uses less digits than its factorization.

204430421523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490240961.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 204430421523 its reverse (325124034402), we get a palindrome (529554455925).

The spelling of 204430421523 in words is "two hundred four billion, four hundred thirty million, four hundred twenty-one thousand, five hundred twenty-three".