11211312111 has 24 divisors (see below), whose sum is σ = 15165784320. Its totient is φ = 7367029824.

The previous prime is 11211312109. The next prime is 11211312149. The reversal of 11211312111 is 11121311211.

It is not a de Polignac number, because 11211312111 - 2¹ = 11211312109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211312811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11001760 + ... + 11002778.

It is an arithmetic number, because the mean of its divisors is an integer number (631907680).

Almost surely, 2^11211312111 is an apocalyptic number.

11211312111 is a deficient number, since it is larger than the sum of its proper divisors (3954472209).

11211312111 is an equidigital number, since it uses as much as digits as its factorization.

11211312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663 (or 1574 counting only the distinct ones).

The product of its digits is 12, while the sum is 15.

Adding to 11211312111 its reverse (11121311211), we get a palindrome (22332623322).

The spelling of 11211312111 in words is "eleven billion, two hundred eleven million, three hundred twelve thousand, one hundred eleven".