211311223 has 2 divisors, whose sum is σ = 211311224. Its totient is φ = 211311222.

The previous prime is 211311209. The next prime is 211311227. The reversal of 211311223 is 322113112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211311223 - 2⁹ = 211310711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211311197 and 211311206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211311227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105655611 + 105655612.

It is an arithmetic number, because the mean of its divisors is an integer number (105655612).

Almost surely, 2^211311223 is an apocalyptic number.

211311223 is a deficient number, since it is larger than the sum of its proper divisors (1).

211311223 is an equidigital number, since it uses as much as digits as its factorization.

211311223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 211311223 is about 14536.5478364019. The cubic root of 211311223 is about 595.6267416113.

Adding to 211311223 its reverse (322113112), we get a palindrome (533424335).

The spelling of 211311223 in words is "two hundred eleven million, three hundred eleven thousand, two hundred twenty-three".