221111112321 has 24 divisors (see below), whose sum is σ = 349127195040. Its totient is φ = 133733779200.

The previous prime is 221111112317. The next prime is 221111112347. The reversal of 221111112321 is 123211111122.

It is a happy number.

221111112321 is a `hidden beast` number, since 221 + 1 + 11 + 112 + 321 = 666.

It is not a de Polignac number, because 221111112321 - 2² = 221111112317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221111112294 and 221111112303.

It is not an unprimeable number, because it can be changed into a prime (221111112721) 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, 2225776 + ... + 2322993.

It is an arithmetic number, because the mean of its divisors is an integer number (14546966460).

Almost surely, 2^221111112321 is an apocalyptic number.

It is an amenable number.

221111112321 is a deficient number, since it is larger than the sum of its proper divisors (128016082719).

221111112321 is a wasteful number, since it uses less digits than its factorization.

221111112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4549277 (or 4549274 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 221111112321 its reverse (123211111122), we get a palindrome (344322223443).

The spelling of 221111112321 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, three hundred twenty-one".