211111212111 has 8 divisors (see below), whose sum is σ = 281730940080. Its totient is φ = 140616146112.

The previous prime is 211111212079. The next prime is 211111212167. The reversal of 211111212111 is 111212111112.

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

It is not a de Polignac number, because 211111212111 - 2⁵ = 211111212079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111212511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31161540 + ... + 31168313.

It is an arithmetic number, because the mean of its divisors is an integer number (35216367510).

Almost surely, 2^211111212111 is an apocalyptic number.

211111212111 is a deficient number, since it is larger than the sum of its proper divisors (70619727969).

211111212111 is a wasteful number, since it uses less digits than its factorization.

211111212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62330985.

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

Adding to 211111212111 its reverse (111212111112), we get a palindrome (322323323223).

The spelling of 211111212111 in words is "two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".