211001100111111 has 16 divisors (see below), whose sum is σ = 285972945953888. Its totient is φ = 138348748137600.

The previous prime is 211001100111107. The next prime is 211001100111163. The reversal of 211001100111111 is 111111001100112.

It is not a de Polignac number, because 211001100111111 - 2² = 211001100111107 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 (211001100118111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50610160 + ... + 54620421.

It is an arithmetic number, because the mean of its divisors is an integer number (17873309122118).

Almost surely, 2^{211001100111111} is an apocalyptic number.

211001100111111 is a deficient number, since it is larger than the sum of its proper divisors (74971845842777).

211001100111111 is a wasteful number, since it uses less digits than its factorization.

211001100111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105241602.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 211001100111111 its reverse (111111001100112), we get a palindrome (322112101211223).

The spelling of 211001100111111 in words is "two hundred eleven trillion, one billion, one hundred million, one hundred eleven thousand, one hundred eleven".