211031311111 has 8 divisors (see below), whose sum is σ = 213587834544. Its totient is φ = 208475120640.

The previous prime is 211031311093. The next prime is 211031311121. The reversal of 211031311111 is 111113130112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211031311111 - 2⁹ = 211031310599 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 (211031311121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1338055 + ... + 1487431.

It is an arithmetic number, because the mean of its divisors is an integer number (26698479318).

Almost surely, 2^211031311111 is an apocalyptic number.

211031311111 is a deficient number, since it is larger than the sum of its proper divisors (2556523433).

211031311111 is a wasteful number, since it uses less digits than its factorization.

211031311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166481.

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 211031311111 its reverse (111113130112), we get a palindrome (322144441223).

The spelling of 211031311111 in words is "two hundred eleven billion, thirty-one million, three hundred eleven thousand, one hundred eleven".