12211211 has 4 divisors (see below), whose sum is σ = 12471072.
Its totient is φ = 11951352.
The previous prime is 12211193. The next prime is 12211217. The reversal of 12211211 is 11211221.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 12211211 - 222 = 8016907 is a prime.
It is a super-2 number, since 2×122112112 = 298227348173042, which contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 12211192 and 12211201.
It is not an unprimeable number, because it can be changed into a prime (12211217) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129860 + ... + 129953.
It is an arithmetic number, because the mean of its divisors is an integer number (3117768).
Almost surely, 212211211 is an apocalyptic number.
12211211 is a deficient number, since it is larger than the sum of its proper divisors (259861).
12211211 is an equidigital number, since it uses as much as digits as its factorization.
12211211 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 259860.
The product of its digits is 8, while the sum is 11.
The square root of 12211211 is about 3494.4543207774.
The cubic root of 12211211 is about 230.2782454838.
Adding to 12211211 its reverse (11211221), we get a palindrome (23422432).
The spelling of 12211211 in words is "twelve million, two hundred eleven thousand, two hundred eleven".