211223303311 has 4 divisors (see below), whose sum is σ = 211224928824. Its totient is φ = 211221677800.

The previous prime is 211223303267. The next prime is 211223303393. The reversal of 211223303311 is 113303322112.

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 211223303311 - 2³³ = 202633368719 is a prime.

It is a super-2 number, since 2×211223303311² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211223306311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599125 + ... + 883966.

It is an arithmetic number, because the mean of its divisors is an integer number (52806232206).

Almost surely, 2^211223303311 is an apocalyptic number.

211223303311 is a deficient number, since it is larger than the sum of its proper divisors (1625513).

211223303311 is a wasteful number, since it uses less digits than its factorization.

211223303311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625512.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 211223303311 its reverse (113303322112), we get a palindrome (324526625423).

The spelling of 211223303311 in words is "two hundred eleven billion, two hundred twenty-three million, three hundred three thousand, three hundred eleven".