22521072 has 80 divisors (see below), whose sum is σ = 67273472. Its totient is φ = 6359040.

The previous prime is 22521041. The next prime is 22521089. The reversal of 22521072 is 27012522.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32247 + ... + 32937.

Almost surely, 2^22521072 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 22521072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33636736).

22521072 is an abundant number, since it is smaller than the sum of its proper divisors (44752400).

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

22521072 is a wasteful number, since it uses less digits than its factorization.

22521072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 22521072 is about 4745.6371542713. The cubic root of 22521072 is about 282.3989123269.

Adding to 22521072 its reverse (27012522), we get a palindrome (49533594).

The spelling of 22521072 in words is "twenty-two million, five hundred twenty-one thousand, seventy-two".