211121121111 has 8 divisors (see below), whose sum is σ = 291201546480. Its totient is φ = 135894054912.

The previous prime is 211121121011. The next prime is 211121121161. The reversal of 211121121111 is 111121121112.

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

It is not a de Polignac number, because 211121121111 - 2¹⁰ = 211121120087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121121161) 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, 1213339690 + ... + 1213339863.

It is an arithmetic number, because the mean of its divisors is an integer number (36400193310).

Almost surely, 2^211121121111 is an apocalyptic number.

211121121111 is a deficient number, since it is larger than the sum of its proper divisors (80080425369).

211121121111 is a wasteful number, since it uses less digits than its factorization.

211121121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426679585.

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

Adding to 211121121111 its reverse (111121121112), we get a palindrome (322242242223).

Subtracting from 211121121111 its reverse (111121121112), we obtain a palindrome (99999999999).

The spelling of 211121121111 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".