21220112212222 has 128 divisors (see below), whose sum is σ = 41329923148800. Its totient is φ = 7928773171200.

The previous prime is 21220112212219. The next prime is 21220112212223. The reversal of 21220112212222 is 22221221102212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21220112212193 and 21220112212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220112212223) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 418657693 + ... + 418708375.

It is an arithmetic number, because the mean of its divisors is an integer number (322890024600).

Almost surely, 2^{21220112212222} is an apocalyptic number.

21220112212222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21220112212222 is a deficient number, since it is larger than the sum of its proper divisors (20109810936578).

21220112212222 is a wasteful number, since it uses less digits than its factorization.

21220112212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51362.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21220112212222 its reverse (22221221102212), we get a palindrome (43441333314434).

The spelling of 21220112212222 in words is "twenty-one trillion, two hundred twenty billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty-two".