211121111111211 has 12 divisors (see below), whose sum is σ = 348517389770992. Its totient is φ = 120640634920656.

The previous prime is 211121111111203. The next prime is 211121111111219. The reversal of 211121111111211 is 112111111121112.

211121111111211 is a `hidden beast` number, since 211 + 1 + 21 + 111 + 111 + 211 = 666.

It is an interprime number because it is at equal distance from previous prime (211121111111203) and next prime (211121111111219).

It is not a de Polignac number, because 211121111111211 - 2³ = 211121111111203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121111111219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1675564373836 + ... + 1675564373961.

Almost surely, 2^{211121111111211} is an apocalyptic number.

211121111111211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211121111111211 is a deficient number, since it is larger than the sum of its proper divisors (137396278659781).

211121111111211 is a wasteful number, since it uses less digits than its factorization.

211121111111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351128747810 (or 3351128747807 counting only the distinct ones).

The product of its digits is 8, while the sum is 18.

Adding to 211121111111211 its reverse (112111111121112), we get a palindrome (323232222232323).

Subtracting from 211121111111211 its reverse (112111111121112), we obtain a palindrome (99009999990099).

The spelling of 211121111111211 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".