211312223 has 2 divisors, whose sum is σ = 211312224. Its totient is φ = 211312222.

The previous prime is 211312181. The next prime is 211312249. The reversal of 211312223 is 322213112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211312223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211312823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105656111 + 105656112.

It is an arithmetic number, because the mean of its divisors is an integer number (105656112).

Almost surely, 2^211312223 is an apocalyptic number.

211312223 is a deficient number, since it is larger than the sum of its proper divisors (1).

211312223 is an equidigital number, since it uses as much as digits as its factorization.

211312223 is an evil number, because the sum of its binary digits is even.

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

The square root of 211312223 is about 14536.5822324231. The cubic root of 211312223 is about 595.6276811825.

Adding to 211312223 its reverse (322213112), we get a palindrome (533525335).

The spelling of 211312223 in words is "two hundred eleven million, three hundred twelve thousand, two hundred twenty-three".