22143312 has 60 divisors (see below), whose sum is σ = 62287680. Its totient is φ = 7343424.

The previous prime is 22143311. The next prime is 22143343. The reversal of 22143312 is 21334122.

22143312 is a `hidden beast` number, since 221 + 433 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22143311) 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, 52639 + ... + 53057.

It is an arithmetic number, because the mean of its divisors is an integer number (1038128).

Almost surely, 2^22143312 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 22143312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31143840).

22143312 is an abundant number, since it is smaller than the sum of its proper divisors (40144368).

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

22143312 is a wasteful number, since it uses less digits than its factorization.

22143312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 791 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 22143312 is about 4705.6680715920. The cubic root of 22143312 is about 280.8110498002.

Adding to 22143312 its reverse (21334122), we get a palindrome (43477434).

It can be divided in two parts, 221433 and 12, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 22143312 in words is "twenty-two million, one hundred forty-three thousand, three hundred twelve".