221311112111 has 8 divisors (see below), whose sum is σ = 240992137200. Its totient is φ = 202433394240.

The previous prime is 221311112083. The next prime is 221311112131. The reversal of 221311112111 is 111211113122.

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

It is a cyclic number.

It is not a de Polignac number, because 221311112111 - 2¹⁴ = 221311095727 is a prime.

It is a super-2 number, since 2×221311112111² (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 221311112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221311112131) 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, 200826230 + ... + 200827331.

It is an arithmetic number, because the mean of its divisors is an integer number (30124017150).

Almost surely, 2^221311112111 is an apocalyptic number.

221311112111 is a deficient number, since it is larger than the sum of its proper divisors (19681025089).

221311112111 is a wasteful number, since it uses less digits than its factorization.

221311112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401653609.

The product of its digits is 24, while the sum is 17.

Adding to 221311112111 its reverse (111211113122), we get a palindrome (332522225233).

It can be divided in two parts, 2213111 and 12111, that added together give a palindrome (2225222).

The spelling of 221311112111 in words is "two hundred twenty-one billion, three hundred eleven million, one hundred twelve thousand, one hundred eleven".