211111312321 has 24 divisors (see below), whose sum is σ = 267655558464. Its totient is φ = 165020637600.

The previous prime is 211111312297. The next prime is 211111312327. The reversal of 211111312321 is 123213111112.

It is not a de Polignac number, because 211111312321 - 2²⁹ = 210574441409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211111312327) 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, 1943605 + ... + 2049346.

It is an arithmetic number, because the mean of its divisors is an integer number (11152314936).

Almost surely, 2^211111312321 is an apocalyptic number.

It is an amenable number.

211111312321 is a deficient number, since it is larger than the sum of its proper divisors (56544246143).

211111312321 is a wasteful number, since it uses less digits than its factorization.

211111312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993061 (or 3993054 counting only the distinct ones).

The product of its digits is 72, while the sum is 19.

Adding to 211111312321 its reverse (123213111112), we get a palindrome (334324423433).

The spelling of 211111312321 in words is "two hundred eleven billion, one hundred eleven million, three hundred twelve thousand, three hundred twenty-one".