211122111122111 has 4 divisors (see below), whose sum is σ = 241282412710992. Its totient is φ = 180961809533232.

The previous prime is 211122111122107. The next prime is 211122111122161. The reversal of 211122111122111 is 111221111221112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 211122111122111 - 2² = 211122111122107 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 (211122111122161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15080150794430 + ... + 15080150794443.

It is an arithmetic number, because the mean of its divisors is an integer number (60320603177748).

Almost surely, 2^{211122111122111} is an apocalyptic number.

211122111122111 is a deficient number, since it is larger than the sum of its proper divisors (30160301588881).

211122111122111 is an equidigital number, since it uses as much as digits as its factorization.

211122111122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30160301588880.

The product of its digits is 32, while the sum is 20.

Adding to 211122111122111 its reverse (111221111221112), we get a palindrome (322343222343223).

Subtracting from 211122111122111 its reverse (111221111221112), we obtain a palindrome (99900999900999).

It can be divided in two parts, 2 and 11122111122111, that multiplied together give a palindrome (22244222244222).

The spelling of 211122111122111 in words is "two hundred eleven trillion, one hundred twenty-two billion, one hundred eleven million, one hundred twenty-two thousand, one hundred eleven".