111212444212111 has 16 divisors (see below), whose sum is σ = 122330966284800. Its totient is φ = 101097566152440.

The previous prime is 111212444212109. The next prime is 111212444212147.

111212444212111 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 111212444212111 - 2¹ = 111212444212109 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 111212444212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212444212511) 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, 27154720 + ... + 30980698.

It is an arithmetic number, because the mean of its divisors is an integer number (7645685392800).

Almost surely, 2^{111212444212111} is an apocalyptic number.

111212444212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111212444212111 is a deficient number, since it is larger than the sum of its proper divisors (11118522072689).

111212444212111 is an equidigital number, since it uses as much as digits as its factorization.

111212444212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847851 (or 3847829 counting only the distinct ones).

The product of its digits is 1024, while the sum is 28.

The spelling of 111212444212111 in words is "one hundred eleven trillion, two hundred twelve billion, four hundred forty-four million, two hundred twelve thousand, one hundred eleven".