211111011 has 12 divisors (see below), whose sum is σ = 313180192. Its totient is φ = 136936656.

The previous prime is 211111003. The next prime is 211111013. The reversal of 211111011 is 110111112.

It is not a de Polignac number, because 211111011 - 2³ = 211111003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211110984 and 211111002.

It is not an unprimeable number, because it can be changed into a prime (211111013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 316651 + ... + 317316.

Almost surely, 2^211111011 is an apocalyptic number.

211111011 is a deficient number, since it is larger than the sum of its proper divisors (102069181).

211111011 is a wasteful number, since it uses less digits than its factorization.

211111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634010 (or 634007 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 211111011 is about 14529.6597000756. The cubic root of 211111011 is about 595.4385684482.

Adding to 211111011 its reverse (110111112), we get a palindrome (321222123).

It can be divided in two parts, 21111 and 1011, that added together give a palindrome (22122).

The spelling of 211111011 in words is "two hundred eleven million, one hundred eleven thousand, eleven".