211121221111 has 8 divisors (see below), whose sum is σ = 211532910080. Its totient is φ = 210709627128.

The previous prime is 211121221097. The next prime is 211121221169. The reversal of 211121221111 is 111122121112.

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 211121221111 - 2¹³ = 211121212919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121225111) 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, 5794810 + ... + 5831128.

It is an arithmetic number, because the mean of its divisors is an integer number (26441613760).

Almost surely, 2^211121221111 is an apocalyptic number.

211121221111 is a deficient number, since it is larger than the sum of its proper divisors (411688969).

211121221111 is a wasteful number, since it uses less digits than its factorization.

211121221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47493.

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

Adding to 211121221111 its reverse (111122121112), we get a palindrome (322243342223).

Subtracting from 211121221111 its reverse (111122121112), we obtain a palindrome (99999099999).

The spelling of 211121221111 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred eleven".