204421030515431 has 4 divisors (see below), whose sum is σ = 205298373994272. Its totient is φ = 203543687036592.

The previous prime is 204421030515391. The next prime is 204421030515467. The reversal of 204421030515431 is 134515030124402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204421030515431 - 2¹⁸ = 204421030253287 is a prime.

It is a super-2 number, since 2×204421030515431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204421030515391 and 204421030515400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204421030515731) 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 in 3 ways as a sum of consecutive naturals, for example, 438671739071 + ... + 438671739536.

It is an arithmetic number, because the mean of its divisors is an integer number (51324593498568).

Almost surely, 2^{204421030515431} is an apocalyptic number.

204421030515431 is a deficient number, since it is larger than the sum of its proper divisors (877343478841).

204421030515431 is an equidigital number, since it uses as much as digits as its factorization.

204421030515431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877343478840.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 204421030515431 its reverse (134515030124402), we get a palindrome (338936060639833).

The spelling of 204421030515431 in words is "two hundred four trillion, four hundred twenty-one billion, thirty million, five hundred fifteen thousand, four hundred thirty-one".