111222121111 has 8 divisors (see below), whose sum is σ = 113545968480. Its totient is φ = 108906618912.

The previous prime is 111222121081. The next prime is 111222121133. The reversal of 111222121111 is 111121222111.

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 111222121111 - 2¹³ = 111222112919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222121411) 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, 2059356 + ... + 2112673.

It is an arithmetic number, because the mean of its divisors is an integer number (14193246060).

Almost surely, 2^111222121111 is an apocalyptic number.

111222121111 is a deficient number, since it is larger than the sum of its proper divisors (2323847369).

111222121111 is an equidigital number, since it uses as much as digits as its factorization.

111222121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4172585.

The product of its digits is 16, while the sum is 16.

Adding to 111222121111 its reverse (111121222111), we get a palindrome (222343343222).

It can be divided in two parts, 111 and 222121111, that added together give a palindrome (222121222).

The spelling of 111222121111 in words is "one hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".