204311771321 has 4 divisors (see below), whose sum is σ = 233499167232. Its totient is φ = 175124375412.

The previous prime is 204311771249. The next prime is 204311771327. The reversal of 204311771321 is 123177113402.

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 not a de Polignac number, because 204311771321 - 2¹⁴ = 204311754937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204311771327) 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, 14593697945 + ... + 14593697958.

It is an arithmetic number, because the mean of its divisors is an integer number (58374791808).

Almost surely, 2^204311771321 is an apocalyptic number.

It is an amenable number.

204311771321 is a deficient number, since it is larger than the sum of its proper divisors (29187395911).

204311771321 is an equidigital number, since it uses as much as digits as its factorization.

204311771321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29187395910.

The product of its (nonzero) digits is 7056, while the sum is 32.

Adding to 204311771321 its reverse (123177113402), we get a palindrome (327488884723).

The spelling of 204311771321 in words is "two hundred four billion, three hundred eleven million, seven hundred seventy-one thousand, three hundred twenty-one".