1222221222222 has 384 divisors, whose sum is σ = 3468446023680. Its totient is φ = 278461048320.

The previous prime is 1222221222217. The next prime is 1222221222253. The reversal of 1222221222222 is 2222221222221.

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 = 1222221222192 and 1222221222201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 124217179 + ... + 124227017.

It is an arithmetic number, because the mean of its divisors is an integer number (9032411520).

Almost surely, 2^{1222221222222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222221222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1734223011840).

1222221222222 is an abundant number, since it is smaller than the sum of its proper divisors (2246224801458).

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

1222221222222 is a wasteful number, since it uses less digits than its factorization.

1222221222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9968 (or 9955 counting only the distinct ones).

The product of its digits is 2048, while the sum is 24.

Adding to 1222221222222 its reverse (2222221222221), we get a palindrome (3444442444443).

Subtracting 1222221222222 from its reverse (2222221222221), we obtain a palindrome (999999999999).

The spelling of 1222221222222 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".