20321213321 has 2 divisors, whose sum is σ = 20321213322. Its totient is φ = 20321213320.

The previous prime is 20321213287. The next prime is 20321213359. The reversal of 20321213321 is 12331212302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18836190025 + 1485023296 = 137245^2 + 38536^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321213321 - 2¹⁰ = 20321212297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20321213293 and 20321213302.

It is not a weakly prime, because it can be changed into another prime (20321213021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160606660 + 10160606661.

It is an arithmetic number, because the mean of its divisors is an integer number (10160606661).

Almost surely, 2^20321213321 is an apocalyptic number.

It is an amenable number.

20321213321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321213321 is an equidigital number, since it uses as much as digits as its factorization.

20321213321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20321213321 its reverse (12331212302), we get a palindrome (32652425623).

The spelling of 20321213321 in words is "twenty billion, three hundred twenty-one million, two hundred thirteen thousand, three hundred twenty-one".