22216500 has 72 divisors (see below), whose sum is σ = 70099848. Its totient is φ = 5923200.

The previous prime is 22216457. The next prime is 22216507. The reversal of 22216500 is 561222.

It can be written as a sum of positive squares in 4 ways, for example, as 1313316 + 20903184 = 1146^2 + 4572^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22216507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2032 + ... + 6968.

It is an arithmetic number, because the mean of its divisors is an integer number (973609).

Almost surely, 2^22216500 is an apocalyptic number.

22216500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22216500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35049924).

22216500 is an abundant number, since it is smaller than the sum of its proper divisors (47883348).

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

22216500 is a wasteful number, since it uses less digits than its factorization.

22216500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962 (or 4947 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 22216500 is about 4713.4382355134. The cubic root of 22216500 is about 281.1200881500.

Adding to 22216500 its reverse (561222), we get a palindrome (22777722).

The spelling of 22216500 in words is "twenty-two million, two hundred sixteen thousand, five hundred".