221323111321 has 6 divisors (see below), whose sum is σ = 239657570430. Its totient is φ = 204298256448.

The previous prime is 221323111301. The next prime is 221323111349. The reversal of 221323111321 is 123111323122.

It can be written as a sum of positive squares in 3 ways, for example, as 8930250000 + 212392861321 = 94500^2 + 460861^2 .

It is not a de Polignac number, because 221323111321 - 2⁹ = 221323110809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221323111292 and 221323111301.

It is not an unprimeable number, because it can be changed into a prime (221323111301) 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, 654801936 + ... + 654802273.

It is an arithmetic number, because the mean of its divisors is an integer number (39942928405).

Almost surely, 2^221323111321 is an apocalyptic number.

It is an amenable number.

221323111321 is a deficient number, since it is larger than the sum of its proper divisors (18334459109).

221323111321 is a wasteful number, since it uses less digits than its factorization.

221323111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309604235 (or 1309604222 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

Adding to 221323111321 its reverse (123111323122), we get a palindrome (344434434443).

The spelling of 221323111321 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred eleven thousand, three hundred twenty-one".