211232209 has 2 divisors, whose sum is σ = 211232210. Its totient is φ = 211232208.

The previous prime is 211232183. The next prime is 211232243. The reversal of 211232209 is 902232112.

211232209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204575809 + 6656400 = 14303^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 211232209 - 2⁹ = 211231697 is a prime.

It is a super-2 number, since 2×211232209² = 89238092238039362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211232209.

It is not a weakly prime, because it can be changed into another prime (211232269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105616104 + 105616105.

It is an arithmetic number, because the mean of its divisors is an integer number (105616105).

Almost surely, 2^211232209 is an apocalyptic number.

It is an amenable number.

211232209 is a deficient number, since it is larger than the sum of its proper divisors (1).

211232209 is an equidigital number, since it uses as much as digits as its factorization.

211232209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 211232209 is about 14533.8298118562. The cubic root of 211232209 is about 595.5524929622.

It can be divided in two parts, 21123 and 2209, that added together give a palindrome (23332).

The spelling of 211232209 in words is "two hundred eleven million, two hundred thirty-two thousand, two hundred nine".