12222222 has 8 divisors (see below), whose sum is σ = 24444456. Its totient is φ = 4074072.

The previous prime is 12222211. The next prime is 12222241. The reversal of 12222222 is 22222221.

It is a sphenic number, since it is the product of 3 distinct primes.

12222222 is an admirable number.

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

12222222 is a modest number, since divided by 2222 gives 1222 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1018513 + ... + 1018524.

It is an arithmetic number, because the mean of its divisors is an integer number (3055557).

Almost surely, 2^12222222 is an apocalyptic number.

12222222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12222222 is a wasteful number, since it uses less digits than its factorization.

12222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037042.

The product of its digits is 128, while the sum is 15.

The square root of 12222222 is about 3496.0294621184. The cubic root of 12222222 is about 230.3474396043.

Adding to 12222222 its reverse (22222221), we get a palindrome (34444443).

Subtracting 12222222 from its reverse (22222221), we obtain a palindrome (9999999).

The spelling of 12222222 in words is "twelve million, two hundred twenty-two thousand, two hundred twenty-two".