22215424 has 144 divisors (see below), whose sum is σ = 58867200. Its totient is φ = 8279040.

The previous prime is 22215409. The next prime is 22215491. The reversal of 22215424 is 42451222.

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 = 22215395 and 22215404.

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 in 15 ways as a sum of consecutive naturals, for example, 965877 + ... + 965899.

It is an arithmetic number, because the mean of its divisors is an integer number (408800).

Almost surely, 2^22215424 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 22215424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29433600).

22215424 is an abundant number, since it is smaller than the sum of its proper divisors (36651776).

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

22215424 is an equidigital number, since it uses as much as digits as its factorization.

22215424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 43 counting only the distinct ones).

The product of its digits is 1280, while the sum is 22.

The square root of 22215424 is about 4713.3240924002. The cubic root of 22215424 is about 281.1155496298.

Adding to 22215424 its reverse (42451222), we get a palindrome (64666646).

The spelling of 22215424 in words is "twenty-two million, two hundred fifteen thousand, four hundred twenty-four".