221322323231 has 16 divisors (see below), whose sum is σ = 226802605920. Its totient is φ = 215912563200.

The previous prime is 221322323147. The next prime is 221322323237. The reversal of 221322323231 is 132323223122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221322323231 is a prime.

It is a super-2 number, since 2×221322323231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221322323231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221322323237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7601780 + ... + 7630838.

It is an arithmetic number, because the mean of its divisors is an integer number (14175162870).

Almost surely, 2^221322323231 is an apocalyptic number.

221322323231 is a deficient number, since it is larger than the sum of its proper divisors (5480282689).

221322323231 is a wasteful number, since it uses less digits than its factorization.

221322323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30266.

The product of its digits is 5184, while the sum is 26.

Adding to 221322323231 its reverse (132323223122), we get a palindrome (353645546353).

The spelling of 221322323231 in words is "two hundred twenty-one billion, three hundred twenty-two million, three hundred twenty-three thousand, two hundred thirty-one".