211111212211 has 4 divisors (see below), whose sum is σ = 220289960592. Its totient is φ = 201932463832.

The previous prime is 211111212167. The next prime is 211111212233. The reversal of 211111212211 is 112212111112.

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

It is a cyclic number.

It is not a de Polignac number, because 211111212211 - 2⁹ = 211111211699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211111212241) 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, 4589374156 + ... + 4589374201.

It is an arithmetic number, because the mean of its divisors is an integer number (55072490148).

Almost surely, 2^211111212211 is an apocalyptic number.

211111212211 is a deficient number, since it is larger than the sum of its proper divisors (9178748381).

211111212211 is an equidigital number, since it uses as much as digits as its factorization.

211111212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9178748380.

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

Adding to 211111212211 its reverse (112212111112), we get a palindrome (323323323323).

The spelling of 211111212211 in words is "two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, two hundred eleven".