221311224231 has 8 divisors (see below), whose sum is σ = 295148759664. Its totient is φ = 147507252480.

The previous prime is 221311224209. The next prime is 221311224247. The reversal of 221311224231 is 132422113122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221311224231 - 2¹⁵ = 221311191463 is a prime.

It is a super-2 number, since 2×221311224231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221311224031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8375530 + ... + 8401911.

It is an arithmetic number, because the mean of its divisors is an integer number (36893594958).

Almost surely, 2^221311224231 is an apocalyptic number.

221311224231 is a deficient number, since it is larger than the sum of its proper divisors (73837535433).

221311224231 is a wasteful number, since it uses less digits than its factorization.

221311224231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16781841.

The product of its digits is 1152, while the sum is 24.

Adding to 221311224231 its reverse (132422113122), we get a palindrome (353733337353).

The spelling of 221311224231 in words is "two hundred twenty-one billion, three hundred eleven million, two hundred twenty-four thousand, two hundred thirty-one".