221321113231 has 24 divisors (see below), whose sum is σ = 238780904544. Its totient is φ = 204694184640.

The previous prime is 221321113213. The next prime is 221321113291. The reversal of 221321113231 is 132311123122.

It is not a de Polignac number, because 221321113231 - 2¹¹ = 221321111183 is a prime.

It is a super-2 number, since 2×221321113231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221321113291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4861185 + ... + 4906501.

It is an arithmetic number, because the mean of its divisors is an integer number (9949204356).

Almost surely, 2^221321113231 is an apocalyptic number.

221321113231 is a deficient number, since it is larger than the sum of its proper divisors (17459791313).

221321113231 is an equidigital number, since it uses as much as digits as its factorization.

221321113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45519 (or 45460 counting only the distinct ones).

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

Adding to 221321113231 its reverse (132311123122), we get a palindrome (353632236353).

The spelling of 221321113231 in words is "two hundred twenty-one billion, three hundred twenty-one million, one hundred thirteen thousand, two hundred thirty-one".