12220211 has 6 divisors (see below), whose sum is σ = 12897612.
Its totient is φ = 11576700.
The previous prime is 12220193. The next prime is 12220217. The reversal of 12220211 is 11202221.
It is a happy number.
It is not a de Polignac number, because 12220211 - 26 = 12220147 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 16.
It is a junction number, because it is equal to n+sod(n) for n = 12220192 and 12220201.
It is not an unprimeable number, because it can be changed into a prime (12220217) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16565 + ... + 17286.
It is an arithmetic number, because the mean of its divisors is an integer number (2149602).
Almost surely, 212220211 is an apocalyptic number.
12220211 is a deficient number, since it is larger than the sum of its proper divisors (677401).
12220211 is an equidigital number, since it uses as much as digits as its factorization.
12220211 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 33889 (or 33870 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 11.
The square root of 12220211 is about 3495.7418382941.
The cubic root of 12220211 is about 230.3348054011.
Adding to 12220211 its reverse (11202221), we get a palindrome (23422432).
The spelling of 12220211 in words is "twelve million, two hundred twenty thousand, two hundred eleven".