22216530 has 64 divisors (see below), whose sum is σ = 61885440. Its totient is φ = 4999104.

The previous prime is 22216507. The next prime is 22216531. The reversal of 22216530 is 3561222.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 22216497 and 22216506.

It is not an unprimeable number, because it can be changed into a prime (22216531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13281 + ... + 14859.

It is an arithmetic number, because the mean of its divisors is an integer number (966960).

Almost surely, 2^22216530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22216530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30942720).

22216530 is an abundant number, since it is smaller than the sum of its proper divisors (39668910).

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

22216530 is a wasteful number, since it uses less digits than its factorization.

22216530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 22216530 is about 4713.4414179026. The cubic root of 22216530 is about 281.1202146865.

Adding to 22216530 its reverse (3561222), we get a palindrome (25777752).

The spelling of 22216530 in words is "twenty-two million, two hundred sixteen thousand, five hundred thirty".