211111111121211 has 24 divisors (see below), whose sum is σ = 350515337833440. Its totient is φ = 119937608954496.

The previous prime is 211111111121159. The next prime is 211111111121233. The reversal of 211111111121211 is 112121111111112.

211111111121211 is a `hidden beast` number, since 211 + 1 + 11 + 111 + 121 + 211 = 666.

It is not a de Polignac number, because 211111111121211 - 2⁷ = 211111111121083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211111111121311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9684873546 + ... + 9684895343.

It is an arithmetic number, because the mean of its divisors is an integer number (14604805743060).

Almost surely, 2^{211111111121211} is an apocalyptic number.

211111111121211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211111111121211 is a deficient number, since it is larger than the sum of its proper divisors (139404226712229).

211111111121211 is a wasteful number, since it uses less digits than its factorization.

211111111121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19369769075 (or 19369769072 counting only the distinct ones).

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

Adding to 211111111121211 its reverse (112121111111112), we get a palindrome (323232222232323).

The spelling of 211111111121211 in words is "two hundred eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, two hundred eleven".