20211223321 has 2 divisors, whose sum is σ = 20211223322. Its totient is φ = 20211223320.

The previous prime is 20211223309. The next prime is 20211223337. The reversal of 20211223321 is 12332211202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19934333721 + 276889600 = 141189^2 + 16640^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211223321 - 2⁹ = 20211222809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211221321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105611660 + 10105611661.

It is an arithmetic number, because the mean of its divisors is an integer number (10105611661).

Almost surely, 2^20211223321 is an apocalyptic number.

It is an amenable number.

20211223321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211223321 is an equidigital number, since it uses as much as digits as its factorization.

20211223321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20211223321 its reverse (12332211202), we get a palindrome (32543434523).

The spelling of 20211223321 in words is "twenty billion, two hundred eleven million, two hundred twenty-three thousand, three hundred twenty-one".