204511321001 has 16 divisors (see below), whose sum is σ = 221418190224. Its totient is φ = 187772841984.

The previous prime is 204511320983. The next prime is 204511321009. The reversal of 204511321001 is 100123115402.

It can be written as a sum of positive squares in 8 ways, for example, as 46466113600 + 158045207401 = 215560^2 + 397549^2 .

It is not a de Polignac number, because 204511321001 - 2¹⁴ = 204511304617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204511321009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13189085 + ... + 13204581.

It is an arithmetic number, because the mean of its divisors is an integer number (13838636889).

Almost surely, 2^204511321001 is an apocalyptic number.

It is an amenable number.

204511321001 is a deficient number, since it is larger than the sum of its proper divisors (16906869223).

204511321001 is a wasteful number, since it uses less digits than its factorization.

204511321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20860.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 204511321001 its reverse (100123115402), we get a palindrome (304634436403).

The spelling of 204511321001 in words is "two hundred four billion, five hundred eleven million, three hundred twenty-one thousand, one".