204513421 has 4 divisors (see below), whose sum is σ = 233729632. Its totient is φ = 175297212.

The previous prime is 204513409. The next prime is 204513427. The reversal of 204513421 is 124315402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204513421 - 2²³ = 196124813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204513392 and 204513401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204513427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14608095 + ... + 14608108.

It is an arithmetic number, because the mean of its divisors is an integer number (58432408).

Almost surely, 2^204513421 is an apocalyptic number.

It is an amenable number.

204513421 is a deficient number, since it is larger than the sum of its proper divisors (29216211).

204513421 is an equidigital number, since it uses as much as digits as its factorization.

204513421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29216210.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 204513421 is about 14300.8188926369. The cubic root of 204513421 is about 589.1699723620.

Adding to 204513421 its reverse (124315402), we get a palindrome (328828823).

The spelling of 204513421 in words is "two hundred four million, five hundred thirteen thousand, four hundred twenty-one".