211221101111 has 8 divisors (see below), whose sum is σ = 213954618240. Its totient is φ = 208495589632.

The previous prime is 211221101099. The next prime is 211221101137. The reversal of 211221101111 is 111101122112.

211221101111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211221101111 - 2¹⁴ = 211221084727 is a prime.

It is a super-2 number, since 2×211221101111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221101191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1948295 + ... + 2053848.

It is an arithmetic number, because the mean of its divisors is an integer number (26744327280).

Almost surely, 2^211221101111 is an apocalyptic number.

211221101111 is a deficient number, since it is larger than the sum of its proper divisors (2733517129).

211221101111 is an equidigital number, since it uses as much as digits as its factorization.

211221101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002825.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211221101111 its reverse (111101122112), we get a palindrome (322322223223).

The spelling of 211221101111 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred one thousand, one hundred eleven".