22221312 has 160 divisors (see below), whose sum is σ = 67174272. Its totient is φ = 6488064.

The previous prime is 22221307. The next prime is 22221319. The reversal of 22221312 is 21312222.

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 = 22221291 and 22221300.

It is not an unprimeable number, because it can be changed into a prime (22221319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 600558 + ... + 600594.

Almost surely, 2^22221312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33587136).

22221312 is an abundant number, since it is smaller than the sum of its proper divisors (44952960).

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

22221312 is a wasteful number, since it uses less digits than its factorization.

22221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 82 counting only the distinct ones).

The product of its digits is 96, while the sum is 15.

The square root of 22221312 is about 4713.9486632758. The cubic root of 22221312 is about 281.1403831591.

Adding to 22221312 its reverse (21312222), we get a palindrome (43533534).

The spelling of 22221312 in words is "twenty-two million, two hundred twenty-one thousand, three hundred twelve".