21222112 has 12 divisors (see below), whose sum is σ = 41781096. Its totient is φ = 10611040.

The previous prime is 21222043. The next prime is 21222143. The reversal of 21222112 is 21122212.

It is a happy number.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21222092 and 21222101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331564 + ... + 331627.

It is an arithmetic number, because the mean of its divisors is an integer number (3481758).

Almost surely, 2^21222112 is an apocalyptic number.

It is an amenable number.

21222112 is a deficient number, since it is larger than the sum of its proper divisors (20558984).

21222112 is an equidigital number, since it uses as much as digits as its factorization.

21222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663201 (or 663193 counting only the distinct ones).

The product of its digits is 32, while the sum is 13.

The square root of 21222112 is about 4606.7463572461. The cubic root of 21222112 is about 276.8616911736.

Adding to 21222112 its reverse (21122212), we get a palindrome (42344324).

The spelling of 21222112 in words is "twenty-one million, two hundred twenty-two thousand, one hundred twelve".