211123223 has 4 divisors (see below), whose sum is σ = 211272600. Its totient is φ = 210973848.

The previous prime is 211123207. The next prime is 211123261. The reversal of 211123223 is 322321112.

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 211123223 - 2⁴ = 211123207 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 (211123273) 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, 72548 + ... + 75401.

It is an arithmetic number, because the mean of its divisors is an integer number (52818150).

Almost surely, 2^211123223 is an apocalyptic number.

211123223 is a deficient number, since it is larger than the sum of its proper divisors (149377).

211123223 is a wasteful number, since it uses less digits than its factorization.

211123223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149376.

The product of its digits is 144, while the sum is 17.

The square root of 211123223 is about 14530.0799378393. The cubic root of 211123223 is about 595.4500495415.

Adding to 211123223 its reverse (322321112), we get a palindrome (533444335).

The spelling of 211123223 in words is "two hundred eleven million, one hundred twenty-three thousand, two hundred twenty-three".