111212111111211 has 48 divisors (see below), whose sum is σ = 185309977874560. Its totient is φ = 65833807762800.

The previous prime is 111212111111191. The next prime is 111212111111237. The reversal of 111212111111211 is 112111111212111.

111212111111211 is a `hidden beast` number, since 11 + 121 + 211 + 1 + 111 + 211 = 666.

It is not a de Polignac number, because 111212111111211 - 2²⁵ = 111212077556779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111212111111111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 395685685 + ... + 395966646.

Almost surely, 2^{111212111111211} is an apocalyptic number.

111212111111211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111212111111211 is a deficient number, since it is larger than the sum of its proper divisors (74097866763349).

111212111111211 is a wasteful number, since it uses less digits than its factorization.

111212111111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791652405 (or 791652388 counting only the distinct ones).

The product of its digits is 8, while the sum is 18.

Adding to 111212111111211 its reverse (112111111212111), we get a palindrome (223323222323322).

The spelling of 111212111111211 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".