211031011 has 4 divisors (see below), whose sum is σ = 211872024. Its totient is φ = 210190000.

The previous prime is 211030951. The next prime is 211031027. The reversal of 211031011 is 110130112.

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

It is a cyclic number.

It is not a de Polignac number, because 211031011 - 2¹¹ = 211028963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211031111) 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 3 ways as a sum of consecutive naturals, for example, 420130 + ... + 420631.

It is an arithmetic number, because the mean of its divisors is an integer number (52968006).

Almost surely, 2^211031011 is an apocalyptic number.

211031011 is a deficient number, since it is larger than the sum of its proper divisors (841013).

211031011 is an equidigital number, since it uses as much as digits as its factorization.

211031011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841012.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 211031011 is about 14526.9064497573. The cubic root of 211031011 is about 595.3633456171.

Adding to 211031011 its reverse (110130112), we get a palindrome (321161123).

The spelling of 211031011 in words is "two hundred eleven million, thirty-one thousand, eleven".