12212222 has 16 divisors (see below), whose sum is σ = 21159792. Its totient is φ = 5224320.

The previous prime is 12212201. The next prime is 12212237. The reversal of 12212222 is 22221221.

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

It is a junction number, because it is equal to n+sod(n) for n = 12212197 and 12212206.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15953 + ... + 16700.

It is an arithmetic number, because the mean of its divisors is an integer number (1322487).

Almost surely, 2^12212222 is an apocalyptic number.

12212222 is a deficient number, since it is larger than the sum of its proper divisors (8947570).

12212222 is a wasteful number, since it uses less digits than its factorization.

12212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32683.

The product of its digits is 64, while the sum is 14.

The square root of 12212222 is about 3494.5989755621. The cubic root of 12212222 is about 230.2846004331.

Adding to 12212222 its reverse (22221221), we get a palindrome (34433443).

It can be divided in two parts, 1221 and 2222, that added together give a palindrome (3443).

The spelling of 12212222 in words is "twelve million, two hundred twelve thousand, two hundred twenty-two".