22515216 has 40 divisors (see below), whose sum is σ = 59040864. Its totient is φ = 7392000.

The previous prime is 22515211. The next prime is 22515217. The reversal of 22515216 is 61251522.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (22515211) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 285 + ... + 6716.

Almost surely, 2^22515216 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 22515216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29520432).

22515216 is an abundant number, since it is smaller than the sum of its proper divisors (36525648).

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

22515216 is a wasteful number, since it uses less digits than its factorization.

22515216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7079 (or 7073 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 22515216 is about 4745.0201264062. The cubic root of 22515216 is about 282.3744334539.

Adding to 22515216 its reverse (61251522), we get a palindrome (83766738).

The spelling of 22515216 in words is "twenty-two million, five hundred fifteen thousand, two hundred sixteen".