12211222 has 4 divisors (see below), whose sum is σ = 18316836. Its totient is φ = 6105610.

The previous prime is 12211217. The next prime is 12211223. The reversal of 12211222 is 22211221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22211221 = 31 ⋅716491.

It is a super-2 number, since 2×12211222² = 298227885466568, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211223) 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 as a sum of consecutive naturals, namely, 3052804 + ... + 3052807.

It is an arithmetic number, because the mean of its divisors is an integer number (4579209).

Almost surely, 2^12211222 is an apocalyptic number.

12211222 is a deficient number, since it is larger than the sum of its proper divisors (6105614).

12211222 is an equidigital number, since it uses as much as digits as its factorization.

12211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105613.

The product of its digits is 32, while the sum is 13.

The square root of 12211222 is about 3494.4558946995. The cubic root of 12211222 is about 230.2783146295.

Adding to 12211222 its reverse (22211221), we get a palindrome (34422443).

Subtracting 12211222 from its reverse (22211221), we obtain a palindrome (9999999).

The spelling of 12211222 in words is "twelve million, two hundred eleven thousand, two hundred twenty-two".