211323243 has 32 divisors (see below), whose sum is σ = 312330816. Its totient is φ = 126517248.

The previous prime is 211323239. The next prime is 211323251. The reversal of 211323243 is 342323112.

It is not a de Polignac number, because 211323243 - 2² = 211323239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211323223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98955 + ... + 101067.

It is an arithmetic number, because the mean of its divisors is an integer number (9760338).

Almost surely, 2^211323243 is an apocalyptic number.

211323243 is a deficient number, since it is larger than the sum of its proper divisors (101007573).

211323243 is a wasteful number, since it uses less digits than its factorization.

211323243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223.

The product of its digits is 864, while the sum is 21.

The square root of 211323243 is about 14536.9612711873. The cubic root of 211323243 is about 595.6380350605.

Adding to 211323243 its reverse (342323112), we get a palindrome (553646355).

The spelling of 211323243 in words is "two hundred eleven million, three hundred twenty-three thousand, two hundred forty-three".