211112121211111 has 8 divisors (see below), whose sum is σ = 222226308223920. Its totient is φ = 199998236472192.

The previous prime is 211112121211099. The next prime is 211112121211171. The reversal of 211112121211111 is 111112121211112.

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

It is a cyclic number.

It is not a de Polignac number, because 211112121211111 - 2¹⁷ = 211112121080039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211112121211171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74134180 + ... + 76929193.

It is an arithmetic number, because the mean of its divisors is an integer number (27778288527990).

Almost surely, 2^{211112121211111} is an apocalyptic number.

211112121211111 is a deficient number, since it is larger than the sum of its proper divisors (11114187012809).

211112121211111 is a wasteful number, since it uses less digits than its factorization.

211112121211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151136945.

The product of its digits is 16, while the sum is 19.

Adding to 211112121211111 its reverse (111112121211112), we get a palindrome (322224242422223).

Subtracting from 211112121211111 its reverse (111112121211112), we obtain a palindrome (99999999999999).

The spelling of 211112121211111 in words is "two hundred eleven trillion, one hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, one hundred eleven".