321112212221 has 2 divisors, whose sum is σ = 321112212222. Its totient is φ = 321112212220.

The previous prime is 321112212217. The next prime is 321112212227. The reversal of 321112212221 is 122212211123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320905255225 + 206956996 = 566485^2 + 14386^2 .

It is a cyclic number.

It is not a de Polignac number, because 321112212221 - 2² = 321112212217 is a prime.

It is a super-2 number, since 2×321112212221² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321112212193 and 321112212202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321112212227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160556106110 + 160556106111.

It is an arithmetic number, because the mean of its divisors is an integer number (160556106111).

Almost surely, 2^321112212221 is an apocalyptic number.

It is an amenable number.

321112212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

321112212221 is an equidigital number, since it uses as much as digits as its factorization.

321112212221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

Adding to 321112212221 its reverse (122212211123), we get a palindrome (443324423344).

The spelling of 321112212221 in words is "three hundred twenty-one billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty-one".