111120121211111 has 4 divisors (see below), whose sum is σ = 113216727271752. Its totient is φ = 109023515150472.

The previous prime is 111120121211101. The next prime is 111120121211303. The reversal of 111120121211111 is 111112121021111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111120121211111 - 2²² = 111120117016807 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 111120121211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120121211101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048303030241 + ... + 1048303030346.

It is an arithmetic number, because the mean of its divisors is an integer number (28304181817938).

Almost surely, 2^{111120121211111} is an apocalyptic number.

111120121211111 is a deficient number, since it is larger than the sum of its proper divisors (2096606060641).

111120121211111 is an equidigital number, since it uses as much as digits as its factorization.

111120121211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096606060640.

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

Adding to 111120121211111 its reverse (111112121021111), we get a palindrome (222232242232222).

The spelling of 111120121211111 in words is "one hundred eleven trillion, one hundred twenty billion, one hundred twenty-one million, two hundred eleven thousand, one hundred eleven".