211111221211 has 32 divisors (see below), whose sum is σ = 234596736000. Its totient is φ = 188381760000.

The previous prime is 211111221199. The next prime is 211111221229. The reversal of 211111221211 is 112122111112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211111221211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211111221511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63990840 + ... + 63994138.

It is an arithmetic number, because the mean of its divisors is an integer number (7331148000).

Almost surely, 2^211111221211 is an apocalyptic number.

211111221211 is a deficient number, since it is larger than the sum of its proper divisors (23485514789).

211111221211 is a wasteful number, since it uses less digits than its factorization.

211111221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3891.

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

Adding to 211111221211 its reverse (112122111112), we get a palindrome (323233332323).

The spelling of 211111221211 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, two hundred eleven".