12209211 has 40 divisors (see below), whose sum is σ = 21245664. Its totient is φ = 6842880.

The previous prime is 12209207. The next prime is 12209233. The reversal of 12209211 is 11290221.

12209211 is a nontrivial binomial coefficient, being equal to C(4942, 2).

It is not a de Polignac number, because 12209211 - 2² = 12209207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12209011) 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 39 ways as a sum of consecutive naturals, for example, 34411 + ... + 34763.

Almost surely, 2^12209211 is an apocalyptic number.

12209211 is the 4941-st triangular number and also the 2471-st hexagonal number.

12209211 is a deficient number, since it is larger than the sum of its proper divisors (9036453).

12209211 is an equidigital number, since it uses as much as digits as its factorization.

12209211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 12209211 is about 3494.1681413464. The cubic root of 12209211 is about 230.2656728395.

Adding to 12209211 its reverse (11290221), we get a palindrome (23499432).

The spelling of 12209211 in words is "twelve million, two hundred nine thousand, two hundred eleven".