111212112111 has 8 divisors (see below), whose sum is σ = 148308113664. Its totient is φ = 74128759320.

The previous prime is 111212112107. The next prime is 111212112113. The reversal of 111212112111 is 111211212111.

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

It is not a de Polignac number, because 111212112111 - 2² = 111212112107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212112113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3141655 + ... + 3176856.

It is an arithmetic number, because the mean of its divisors is an integer number (18538514208).

Almost surely, 2^111212112111 is an apocalyptic number.

111212112111 is a deficient number, since it is larger than the sum of its proper divisors (37096001553).

111212112111 is an equidigital number, since it uses as much as digits as its factorization.

111212112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324381.

The product of its digits is 8, while the sum is 15.

Adding to 111212112111 its reverse (111211212111), we get a palindrome (222423324222).

The spelling of 111212112111 in words is "one hundred eleven billion, two hundred twelve million, one hundred twelve thousand, one hundred eleven".