111212105 has 12 divisors (see below), whose sum is σ = 136367940. Its totient is φ = 87068064.

The previous prime is 111212099. The next prime is 111212117. The reversal of 111212105 is 501212111.

It can be written as a sum of positive squares in 2 ways, for example, as 33965584 + 77246521 = 5828^2 + 8789^2 .

It is not a de Polignac number, because 111212105 - 2⁶ = 111212041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111212105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6011 + ... + 16079.

It is an arithmetic number, because the mean of its divisors is an integer number (11363995).

Almost surely, 2^111212105 is an apocalyptic number.

It is an amenable number.

111212105 is a deficient number, since it is larger than the sum of its proper divisors (25155835).

111212105 is an equidigital number, since it uses as much as digits as its factorization.

111212105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10168 (or 10121 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 111212105 is about 10545.7150065797. The cubic root of 111212105 is about 480.8954710524.

Adding to 111212105 its reverse (501212111), we get a palindrome (612424216).

The spelling of 111212105 in words is "one hundred eleven million, two hundred twelve thousand, one hundred five".