320021243222221 has 2 divisors, whose sum is σ = 320021243222222. Its totient is φ = 320021243222220.

The previous prime is 320021243222159. The next prime is 320021243222269. The reversal of 320021243222221 is 122222342120023.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308950577460100 + 11070665762121 = 17576990^2 + 3327261^2 .

It is a cyclic number.

It is not a de Polignac number, because 320021243222221 - 2⁴⁵ = 284836871133389 is a prime.

It is a super-2 number, since 2×320021243222221² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320021243222221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320021243228221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160010621611110 + 160010621611111.

It is an arithmetic number, because the mean of its divisors is an integer number (160010621611111).

Almost surely, 2^{320021243222221} is an apocalyptic number.

It is an amenable number.

320021243222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320021243222221 is an equidigital number, since it uses as much as digits as its factorization.

320021243222221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 320021243222221 its reverse (122222342120023), we get a palindrome (442243585342244).

The spelling of 320021243222221 in words is "three hundred twenty trillion, twenty-one billion, two hundred forty-three million, two hundred twenty-two thousand, two hundred twenty-one".