204542453421 has 24 divisors (see below), whose sum is σ = 313835375360. Its totient is φ = 131659495632.

The previous prime is 204542453419. The next prime is 204542453477. The reversal of 204542453421 is 124354245402.

204542453421 is a `hidden beast` number, since 20 + 4 + 54 + 245 + 342 + 1 = 666.

It is not a de Polignac number, because 204542453421 - 2¹ = 204542453419 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204542455421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4481245 + ... + 4526658.

Almost surely, 2^204542453421 is an apocalyptic number.

It is an amenable number.

204542453421 is a deficient number, since it is larger than the sum of its proper divisors (109292921939).

204542453421 is an equidigital number, since it uses as much as digits as its factorization.

204542453421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9007970 (or 9007935 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 36.

Adding to 204542453421 its reverse (124354245402), we get a palindrome (328896698823).

The spelling of 204542453421 in words is "two hundred four billion, five hundred forty-two million, four hundred fifty-three thousand, four hundred twenty-one".