12222111 has 32 divisors (see below), whose sum is σ = 18996480.
Its totient is φ = 6912000.
The previous prime is 12222109. The next prime is 12222121. The reversal of 12222111 is 11122221.
It is not a de Polignac number, because 12222111 - 21 = 12222109 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12222101) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63231 + ... + 63423.
It is an arithmetic number, because the mean of its divisors is an integer number (593640).
Almost surely, 212222111 is an apocalyptic number.
12222111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
12222111 is a deficient number, since it is larger than the sum of its proper divisors (6774369).
12222111 is a wasteful number, since it uses less digits than its factorization.
12222111 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 327.
The product of its digits is 16, while the sum is 12.
The square root of 12222111 is about 3496.0135869301.
The cubic root of 12222111 is about 230.3467422777.
Adding to 12222111 its reverse (11122221), we get a palindrome (23344332).
It can be divided in two parts, 122221 and 11, that multiplied together give a palindrome (1344431).
The spelling of 12222111 in words is "twelve million, two hundred twenty-two thousand, one hundred eleven".