205321340013 has 4 divisors (see below), whose sum is σ = 273761786688. Its totient is φ = 136880893340.

The previous prime is 205321339997. The next prime is 205321340051. The reversal of 205321340013 is 310043123502.

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 not a de Polignac number, because 205321340013 - 2⁴ = 205321339997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205321340093) 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, 34220223333 + ... + 34220223338.

It is an arithmetic number, because the mean of its divisors is an integer number (68440446672).

Almost surely, 2^205321340013 is an apocalyptic number.

It is an amenable number.

205321340013 is a deficient number, since it is larger than the sum of its proper divisors (68440446675).

205321340013 is an equidigital number, since it uses as much as digits as its factorization.

205321340013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68440446674.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 205321340013 its reverse (310043123502), we get a palindrome (515364463515).

The spelling of 205321340013 in words is "two hundred five billion, three hundred twenty-one million, three hundred forty thousand, thirteen".