111100221121 has 16 divisors (see below), whose sum is σ = 118122681600. Its totient is φ = 104199123600.

The previous prime is 111100221109. The next prime is 111100221179. The reversal of 111100221121 is 121122001111.

It is a happy number.

It is not a de Polignac number, because 111100221121 - 2³¹ = 108952737473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111100221521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 989626 + ... + 1096156.

It is an arithmetic number, because the mean of its divisors is an integer number (7382667600).

Almost surely, 2^111100221121 is an apocalyptic number.

It is an amenable number.

111100221121 is a deficient number, since it is larger than the sum of its proper divisors (7022460479).

111100221121 is a wasteful number, since it uses less digits than its factorization.

111100221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107100.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111100221121 its reverse (121122001111), we get a palindrome (232222222232).

The spelling of 111100221121 in words is "one hundred eleven billion, one hundred million, two hundred twenty-one thousand, one hundred twenty-one".