20321222013013 has 4 divisors (see below), whose sum is σ = 20816861574348. Its totient is φ = 19825582451680.

The previous prime is 20321222012947. The next prime is 20321222013061. The reversal of 20321222013013 is 31031022212302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9119663134884 + 11201558878129 = 3019878^2 + 3346873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321222013013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321222013083) 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, 247819780606 + ... + 247819780687.

It is an arithmetic number, because the mean of its divisors is an integer number (5204215393587).

Almost surely, 2^{20321222013013} is an apocalyptic number.

It is an amenable number.

20321222013013 is a deficient number, since it is larger than the sum of its proper divisors (495639561335).

20321222013013 is an equidigital number, since it uses as much as digits as its factorization.

20321222013013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495639561334.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20321222013013 its reverse (31031022212302), we get a palindrome (51352244225315).

The spelling of 20321222013013 in words is "twenty trillion, three hundred twenty-one billion, two hundred twenty-two million, thirteen thousand, thirteen".