22521224 has 16 divisors (see below), whose sum is σ = 46066320. Its totient is φ = 10236880.

The previous prime is 22521223. The next prime is 22521229. The reversal of 22521224 is 42212522.

It is a junction number, because it is equal to n+sod(n) for n = 22521196 and 22521205.

It is not an unprimeable number, because it can be changed into a prime (22521223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127874 + ... + 128049.

It is an arithmetic number, because the mean of its divisors is an integer number (2879145).

Almost surely, 2^22521224 is an apocalyptic number.

It is an amenable number.

22521224 is an abundant number, since it is smaller than the sum of its proper divisors (23545096).

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

22521224 is a wasteful number, since it uses less digits than its factorization.

22521224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255940 (or 255936 counting only the distinct ones).

The product of its digits is 640, while the sum is 20.

The square root of 22521224 is about 4745.6531689537. The cubic root of 22521224 is about 282.3995476510.

Adding to 22521224 its reverse (42212522), we get a palindrome (64733746).

The spelling of 22521224 in words is "twenty-two million, five hundred twenty-one thousand, two hundred twenty-four".