221111112111 has 8 divisors (see below), whose sum is σ = 302782784304. Its totient is φ = 143423424000.

The previous prime is 221111112091. The next prime is 221111112113. The reversal of 221111112111 is 111211111122.

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

It is not a de Polignac number, because 221111112111 - 2¹³ = 221111103919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111112113) 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, 995995890 + ... + 995996111.

It is an arithmetic number, because the mean of its divisors is an integer number (37847848038).

Almost surely, 2^221111112111 is an apocalyptic number.

221111112111 is a deficient number, since it is larger than the sum of its proper divisors (81671672193).

221111112111 is a wasteful number, since it uses less digits than its factorization.

221111112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991992041.

The product of its digits is 8, while the sum is 15.

Adding to 221111112111 its reverse (111211111122), we get a palindrome (332322223233).

It can be divided in two parts, 2211111 and 12111, that added together give a palindrome (2223222).

The spelling of 221111112111 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, one hundred eleven".