204655807321 has 9 divisors (see below), whose sum is σ = 238072684149. Its totient is φ = 175416549084.

The previous prime is 204655807309. The next prime is 204655807327. The reversal of 204655807321 is 123708556402.

The square root of 204655807321 is 452389.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 204655807321 - 2⁷ = 204655807193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204655807327) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3134410 + ... + 3199036.

It is an arithmetic number, because the mean of its divisors is an integer number (26452520461).

Almost surely, 2^204655807321 is an apocalyptic number.

204655807321 is the 452389-th square number.

204655807321 is the 226195-th centered octagonal number.

It is an amenable number.

204655807321 is a deficient number, since it is larger than the sum of its proper divisors (33416876828).

204655807321 is an frugal number, since it uses more digits than its factorization.

204655807321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129268 (or 64634 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 204655807321 in words is "two hundred four billion, six hundred fifty-five million, eight hundred seven thousand, three hundred twenty-one".