211211101221111 has 12 divisors (see below), whose sum is σ = 305125798720080. Its totient is φ = 140787509911200.

The previous prime is 211211101221089. The next prime is 211211101221149. The reversal of 211211101221111 is 111122101112112.

211211101221111 is a `hidden beast` number, since 21 + 1 + 211 + 101 + 221 + 111 = 666.

It is not a de Polignac number, because 211211101221111 - 2⁹ = 211211101220599 is a prime.

It is a super-2 number, since 2×211211101221111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211101229111) 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, 1657507990 + ... + 1657635411.

It is an arithmetic number, because the mean of its divisors is an integer number (25427149893340).

Almost surely, 2^{211211101221111} is an apocalyptic number.

211211101221111 is a deficient number, since it is larger than the sum of its proper divisors (93914697498969).

211211101221111 is a wasteful number, since it uses less digits than its factorization.

211211101221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315150486 (or 3315150483 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 211211101221111 its reverse (111122101112112), we get a palindrome (322333202333223).

The spelling of 211211101221111 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred one million, two hundred twenty-one thousand, one hundred eleven".