211231223 has 4 divisors (see below), whose sum is σ = 241407120. Its totient is φ = 181055328.

The previous prime is 211231219. The next prime is 211231271. The reversal of 211231223 is 322132112.

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 211231223 - 2² = 211231219 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 (211231723) 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, 15087938 + ... + 15087951.

It is an arithmetic number, because the mean of its divisors is an integer number (60351780).

Almost surely, 2^211231223 is an apocalyptic number.

211231223 is a deficient number, since it is larger than the sum of its proper divisors (30175897).

211231223 is an equidigital number, since it uses as much as digits as its factorization.

211231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30175896.

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

The square root of 211231223 is about 14533.7958909570. The cubic root of 211231223 is about 595.5515663111.

Adding to 211231223 its reverse (322132112), we get a palindrome (533363335).

The spelling of 211231223 in words is "two hundred eleven million, two hundred thirty-one thousand, two hundred twenty-three".