211111221212211 has 16 divisors (see below), whose sum is σ = 295691234860800. Its totient is φ = 133718147307360.

The previous prime is 211111221212201. The next prime is 211111221212237. The reversal of 211111221212211 is 112212122111112.

It is not a de Polignac number, because 211111221212211 - 2¹⁴ = 211111221195827 is a prime.

It is a super-2 number, since 2×211111221212211² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211111221212201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10267046485 + ... + 10267067046.

It is an arithmetic number, because the mean of its divisors is an integer number (18480702178800).

Almost surely, 2^{211111221212211} is an apocalyptic number.

211111221212211 is a deficient number, since it is larger than the sum of its proper divisors (84580013648589).

211111221212211 is a wasteful number, since it uses less digits than its factorization.

211111221212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20534113706.

The product of its digits is 64, while the sum is 21.

Adding to 211111221212211 its reverse (112212122111112), we get a palindrome (323323343323323).

The spelling of 211111221212211 in words is "two hundred eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred eleven".