211121111111 has 2 divisors, whose sum is σ = 211121111112. Its totient is φ = 211121111110.

The previous prime is 211121111107. The next prime is 211121111161. The reversal of 211121111111 is 111111121112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211121111111 - 2² = 211121111107 is a prime.

211121111111 is a modest number, since divided by 1111111 gives 21112 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121111161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560555555 + 105560555556.

It is an arithmetic number, because the mean of its divisors is an integer number (105560555556).

Almost surely, 2^211121111111 is an apocalyptic number.

211121111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121111111 is an equidigital number, since it uses as much as digits as its factorization.

211121111111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4, while the sum is 14.

Adding to 211121111111 its reverse (111111121112), we get a palindrome (322232232223).

It can be divided in two parts, 21112 and 1111111, that multiplied together give a palindrome (23457775432).

The spelling of 211121111111 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".