211111121 has 8 divisors (see below), whose sum is σ = 227520384. Its totient is φ = 194726160.

The previous prime is 211111079. The next prime is 211111129. The reversal of 211111121 is 121111112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211111121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211111129) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14600 + ... + 25206.

It is an arithmetic number, because the mean of its divisors is an integer number (28440048).

Almost surely, 2^211111121 is an apocalyptic number.

It is an amenable number.

211111121 is a deficient number, since it is larger than the sum of its proper divisors (16409263).

211111121 is a wasteful number, since it uses less digits than its factorization.

211111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12151.

The product of its digits is 4, while the sum is 11.

The square root of 211111121 is about 14529.6634854356. The cubic root of 211111121 is about 595.4386718666.

Adding to 211111121 its reverse (121111112), we get a palindrome (332222233).

Subtracting from 211111121 its reverse (121111112), we obtain a palindrome (90000009).

The spelling of 211111121 in words is "two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".