211128223 has 2 divisors, whose sum is σ = 211128224. Its totient is φ = 211128222.

The previous prime is 211128221. The next prime is 211128251. The reversal of 211128223 is 322821112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211128223 - 2¹ = 211128221 is a prime.

Together with 211128221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 211128194 and 211128203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211128221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105564111 + 105564112.

It is an arithmetic number, because the mean of its divisors is an integer number (105564112).

Almost surely, 2^211128223 is an apocalyptic number.

211128223 is a deficient number, since it is larger than the sum of its proper divisors (1).

211128223 is an equidigital number, since it uses as much as digits as its factorization.

211128223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 211128223 is about 14530.2519936855. The cubic root of 211128223 is about 595.4547501561.

Adding to 211128223 its reverse (322821112), we get a palindrome (533949335).

The spelling of 211128223 in words is "two hundred eleven million, one hundred twenty-eight thousand, two hundred twenty-three".