21222222111222 has 24 divisors (see below), whose sum is σ = 46653810593208. Its totient is φ = 6430976397120.

The previous prime is 21222222111193. The next prime is 21222222111227. The reversal of 21222222111222 is 22211122222212.

It is a happy number.

It is a super-2 number, since 2×21222222111222² (a number of 27 digits) contains 22 as substring.

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 = 21222222111192 and 21222222111201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222222111227) 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, 14615854723 + ... + 14615856174.

It is an arithmetic number, because the mean of its divisors is an integer number (1943908774717).

Almost surely, 2^{21222222111222} is an apocalyptic number.

21222222111222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21222222111222 is an abundant number, since it is smaller than the sum of its proper divisors (25431588481986).

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

21222222111222 is a wasteful number, since it uses less digits than its factorization.

21222222111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29231710924 (or 29231710913 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

Adding to 21222222111222 its reverse (22211122222212), we get a palindrome (43433344333434).

The spelling of 21222222111222 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-two".