12122211 has 4 divisors (see below), whose sum is σ = 16162952. Its totient is φ = 8081472.

The previous prime is 12122191. The next prime is 12122221. The reversal of 12122211 is 11222121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11222121 = 3 ⋅3740707.

It is not a de Polignac number, because 12122211 - 2⁵ = 12122179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12122221) 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 3 ways as a sum of consecutive naturals, for example, 2020366 + ... + 2020371.

It is an arithmetic number, because the mean of its divisors is an integer number (4040738).

Almost surely, 2^12122211 is an apocalyptic number.

12122211 is a deficient number, since it is larger than the sum of its proper divisors (4040741).

12122211 is an equidigital number, since it uses as much as digits as its factorization.

12122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040740.

The product of its digits is 16, while the sum is 12.

The square root of 12122211 is about 3481.6965692030. The cubic root of 12122211 is about 229.7174286606.

Adding to 12122211 its reverse (11222121), we get a palindrome (23344332).

It can be divided in two parts, 1 and 2122211, that added together give a palindrome (2122212).

The spelling of 12122211 in words is "twelve million, one hundred twenty-two thousand, two hundred eleven".