111221112111 has 8 divisors (see below), whose sum is σ = 152302784304. Its totient is φ = 72143424000.

The previous prime is 111221112043. The next prime is 111221112131. The reversal of 111221112111 is 111211122111.

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

It is a de Polignac number, because none of the positive numbers 2^k-111221112111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221112131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500995890 + ... + 500996111.

It is an arithmetic number, because the mean of its divisors is an integer number (19037848038).

Almost surely, 2^111221112111 is an apocalyptic number.

111221112111 is a deficient number, since it is larger than the sum of its proper divisors (41081672193).

111221112111 is a wasteful number, since it uses less digits than its factorization.

111221112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001992041.

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

Adding to 111221112111 its reverse (111211122111), we get a palindrome (222432234222).

It can be divided in two parts, 1112 and 21112111, that multiplied together give a palindrome (23476667432).

The spelling of 111221112111 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, one hundred eleven".