111111121 has 8 divisors (see below), whose sum is σ = 121442688. Its totient is φ = 100818000.

The previous prime is 111111113. The next prime is 111111131. The reversal of 111111121 is 121111111.

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 111111121 - 2³ = 111111113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111098 and 111111107.

It is not an unprimeable number, because it can be changed into a prime (111111131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3385 + ... + 15286.

It is an arithmetic number, because the mean of its divisors is an integer number (15180336).

Almost surely, 2^111111121 is an apocalyptic number.

111111121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111111121 is a deficient number, since it is larger than the sum of its proper divisors (10331567).

111111121 is a wasteful number, since it uses less digits than its factorization.

111111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19223.

The product of its digits is 2, while the sum is 10.

The square root of 111111121 is about 10540.9260029658. The cubic root of 111111121 is about 480.7498710314.

Subtracting from 111111121 its sum of digits (10), we obtain a palindrome (111111111).

Adding to 111111121 its reverse (121111111), we get a palindrome (232222232).

It can be divided in two parts, 111111 and 121, that multiplied together give a palindrome (13444431).

The spelling of 111111121 in words is "one hundred eleven million, one hundred eleven thousand, one hundred twenty-one".