211211100000111 has 4 divisors (see below), whose sum is σ = 281614800000152. Its totient is φ = 140807400000072.

The previous prime is 211211100000097. The next prime is 211211100000151. The reversal of 211211100000111 is 111000001112112.

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

It is not a de Polignac number, because 211211100000111 - 2⁵ = 211211100000079 is a prime.

It is a super-2 number, since 2×211211100000111² (a number of 29 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 (211211100000151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35201850000016 + ... + 35201850000021.

It is an arithmetic number, because the mean of its divisors is an integer number (70403700000038).

Almost surely, 2^{211211100000111} is an apocalyptic number.

211211100000111 is a deficient number, since it is larger than the sum of its proper divisors (70403700000041).

211211100000111 is an equidigital number, since it uses as much as digits as its factorization.

211211100000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70403700000040.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 211211100000111 its reverse (111000001112112), we get a palindrome (322211101112223).

It can be divided in two parts, 2112 and 11100000111, that multiplied together give a palindrome (23443200234432).

The spelling of 211211100000111 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred million, one hundred eleven", and thus it is an aban number.