111111221121 has 4 divisors (see below), whose sum is σ = 148148294832. Its totient is φ = 74074147412.

The previous prime is 111111221119. The next prime is 111111221153. The reversal of 111111221121 is 121122111111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111111221121 - 2¹ = 111111221119 is a prime.

It is a super-3 number, since 3×111111221121³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111111221121.

It is not an unprimeable number, because it can be changed into a prime (111111228121) 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 3 ways as a sum of consecutive naturals, for example, 18518536851 + ... + 18518536856.

It is an arithmetic number, because the mean of its divisors is an integer number (37037073708).

Almost surely, 2^111111221121 is an apocalyptic number.

It is an amenable number.

111111221121 is a deficient number, since it is larger than the sum of its proper divisors (37037073711).

111111221121 is an equidigital number, since it uses as much as digits as its factorization.

111111221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37037073710.

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

Adding to 111111221121 its reverse (121122111111), we get a palindrome (232233332232).

The spelling of 111111221121 in words is "one hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".