205045355321 has 4 divisors (see below), whose sum is σ = 207933318144. Its totient is φ = 202157392500.

The previous prime is 205045355267. The next prime is 205045355363. The reversal of 205045355321 is 123553540502.

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 a de Polignac number, because none of the positive numbers 2^k-205045355321 is a prime.

It is a super-3 number, since 3×205045355321³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205045351321) 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, 1443981305 + ... + 1443981446.

It is an arithmetic number, because the mean of its divisors is an integer number (51983329536).

Almost surely, 2^205045355321 is an apocalyptic number.

It is an amenable number.

205045355321 is a deficient number, since it is larger than the sum of its proper divisors (2887962823).

205045355321 is an equidigital number, since it uses as much as digits as its factorization.

205045355321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887962822.

The product of its (nonzero) digits is 90000, while the sum is 35.

Adding to 205045355321 its reverse (123553540502), we get a palindrome (328598895823).

The spelling of 205045355321 in words is "two hundred five billion, forty-five million, three hundred fifty-five thousand, three hundred twenty-one".