321111123221 has 6 divisors (see below), whose sum is σ = 373537429110. Its totient is φ = 275238105576.

The previous prime is 321111123181. The next prime is 321111123253. The reversal of 321111123221 is 122321111123.

It can be written as a sum of positive squares in only one way, i.e., 172319632996 + 148791490225 = 415114^2 + 385735^2 .

It is a de Polignac number, because none of the positive numbers 2^k-321111123221 is a prime.

It is a super-2 number, since 2×321111123221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 321111123193 and 321111123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321111123271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3276644066 + ... + 3276644163.

It is an arithmetic number, because the mean of its divisors is an integer number (62256238185).

Almost surely, 2^321111123221 is an apocalyptic number.

It is an amenable number.

321111123221 is a deficient number, since it is larger than the sum of its proper divisors (52426305889).

321111123221 is an equidigital number, since it uses as much as digits as its factorization.

321111123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6553288243 (or 6553288236 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 321111123221 its reverse (122321111123), we get a palindrome (443432234344).

The spelling of 321111123221 in words is "three hundred twenty-one billion, one hundred eleven million, one hundred twenty-three thousand, two hundred twenty-one".