12212211222 has 24 divisors (see below), whose sum is σ = 28016249976. Its totient is φ = 3831281856.

The previous prime is 12212211127. The next prime is 12212211223. The reversal of 12212211222 is 22211221221.

It is a happy number.

12212211222 is a `hidden beast` number, since 1 + 221 + 221 + 1 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 = 12212211195 and 12212211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212211223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19954288 + ... + 19954899.

It is an arithmetic number, because the mean of its divisors is an integer number (1167343749).

Almost surely, 2^12212211222 is an apocalyptic number.

12212211222 is an abundant number, since it is smaller than the sum of its proper divisors (15804038754).

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

12212211222 is a wasteful number, since it uses less digits than its factorization.

12212211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39909212 (or 39909209 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 12212211222 its reverse (22211221221), we get a palindrome (34423432443).

Subtracting 12212211222 from its reverse (22211221221), we obtain a palindrome (9999009999).

The spelling of 12212211222 in words is "twelve billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty-two".