321110111221 has 2 divisors, whose sum is σ = 321110111222. Its totient is φ = 321110111220.

The previous prime is 321110111143. The next prime is 321110111251. The reversal of 321110111221 is 122111011123.

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., 293562410596 + 27547700625 = 541814^2 + 165975^2 .

It is a cyclic number.

It is not a de Polignac number, because 321110111221 - 2⁷ = 321110111093 is a prime.

It is a super-2 number, since 2×321110111221² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321110111195 and 321110111204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321110111251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160555055610 + 160555055611.

It is an arithmetic number, because the mean of its divisors is an integer number (160555055611).

Almost surely, 2^321110111221 is an apocalyptic number.

It is an amenable number.

321110111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

321110111221 is an equidigital number, since it uses as much as digits as its factorization.

321110111221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 321110111221 its reverse (122111011123), we get a palindrome (443221122344).

It can be divided in two parts, 32111011122 and 1, that added together give a palindrome (32111011123).

The spelling of 321110111221 in words is "three hundred twenty-one billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".