321220022173 has 2 divisors, whose sum is σ = 321220022174. Its totient is φ = 321220022172.

The previous prime is 321220022093. The next prime is 321220022209. The reversal of 321220022173 is 371220022123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180758474649 + 140461547524 = 425157^2 + 374782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321220022173 is a prime.

It is a super-2 number, since 2×321220022173² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321200022173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610011086 + 160610011087.

It is an arithmetic number, because the mean of its divisors is an integer number (160610011087).

Almost surely, 2^321220022173 is an apocalyptic number.

It is an amenable number.

321220022173 is a deficient number, since it is larger than the sum of its proper divisors (1).

321220022173 is an equidigital number, since it uses as much as digits as its factorization.

321220022173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 321220022173 its reverse (371220022123), we get a palindrome (692440044296).

The spelling of 321220022173 in words is "three hundred twenty-one billion, two hundred twenty million, twenty-two thousand, one hundred seventy-three".