204552120321 has 6 divisors (see below), whose sum is σ = 295464173810. Its totient is φ = 136368080208.

The previous prime is 204552120319. The next prime is 204552120329. The reversal of 204552120321 is 123021255402.

204552120321 is a `hidden beast` number, since 2 + 0 + 455 + 2 + 1 + 203 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 185498183025 + 19053937296 = 430695^2 + 138036^2 .

It is not a de Polignac number, because 204552120321 - 2¹ = 204552120319 is a prime.

It is a super-2 number, since 2×204552120321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204552120329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11364006676 + ... + 11364006693.

Almost surely, 2^204552120321 is an apocalyptic number.

It is an amenable number.

204552120321 is a deficient number, since it is larger than the sum of its proper divisors (90912053489).

204552120321 is a wasteful number, since it uses less digits than its factorization.

204552120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22728013375 (or 22728013372 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 204552120321 its reverse (123021255402), we get a palindrome (327573375723).

The spelling of 204552120321 in words is "two hundred four billion, five hundred fifty-two million, one hundred twenty thousand, three hundred twenty-one".