111121220111111 has 8 divisors (see below), whose sum is σ = 127640328251040. Its totient is φ = 94763274002208.

The previous prime is 111121220111093. The next prime is 111121220111113. The reversal of 111121220111111 is 111111022121111.

It is a happy number.

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

It is not a de Polignac number, because 111121220111111 - 2⁴⁶ = 40752475933447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111121220111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121220111113) 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, 40290506276 + ... + 40290509033.

It is an arithmetic number, because the mean of its divisors is an integer number (15955041031380).

Almost surely, 2^{111121220111111} is an apocalyptic number.

111121220111111 is a deficient number, since it is larger than the sum of its proper divisors (16519108139929).

111121220111111 is an equidigital number, since it uses as much as digits as its factorization.

111121220111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80581015513.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 111121220111111 its reverse (111111022121111), we get a palindrome (222232242232222).

The spelling of 111121220111111 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, one hundred eleven".