20321131201321 has 4 divisors (see below), whose sum is σ = 20321679169792. Its totient is φ = 20320583232852.

The previous prime is 20321131201309. The next prime is 20321131201339. The reversal of 20321131201321 is 12310213112302.

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 20321131201321 - 2¹⁷ = 20321131070249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20321131201292 and 20321131201301.

It is not an unprimeable number, because it can be changed into a prime (20321131201381) 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, 273928605 + ... + 274002778.

It is an arithmetic number, because the mean of its divisors is an integer number (5080419792448).

Almost surely, 2^{20321131201321} is an apocalyptic number.

It is an amenable number.

20321131201321 is a deficient number, since it is larger than the sum of its proper divisors (547968471).

20321131201321 is an equidigital number, since it uses as much as digits as its factorization.

20321131201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547968470.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20321131201321 its reverse (12310213112302), we get a palindrome (32631344313623).

The spelling of 20321131201321 in words is "twenty trillion, three hundred twenty-one billion, one hundred thirty-one million, two hundred one thousand, three hundred twenty-one".