211001011111 has 16 divisors (see below), whose sum is σ = 243753300000. Its totient is φ = 180513249280.

The previous prime is 211001011103. The next prime is 211001011127. The reversal of 211001011111 is 111110100112.

211001011111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 211001011111 - 2³ = 211001011103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001021111) 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 15 ways as a sum of consecutive naturals, for example, 1542015 + ... + 1673263.

It is an arithmetic number, because the mean of its divisors is an integer number (15234581250).

Almost surely, 2^211001011111 is an apocalyptic number.

211001011111 is a deficient number, since it is larger than the sum of its proper divisors (32752288889).

211001011111 is a wasteful number, since it uses less digits than its factorization.

211001011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139874.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 211001011111 its reverse (111110100112), we get a palindrome (322111111223).

The spelling of 211001011111 in words is "two hundred eleven billion, one million, eleven thousand, one hundred eleven".