22521804 has 48 divisors (see below), whose sum is σ = 56191968. Its totient is φ = 6995968.

The previous prime is 22521803. The next prime is 22521823. The reversal of 22521804 is 40812522.

It is not an unprimeable number, because it can be changed into a prime (22521803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22564 + ... + 23540.

It is an arithmetic number, because the mean of its divisors is an integer number (1170666).

Almost surely, 2^22521804 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 22521804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28095984).

22521804 is an abundant number, since it is smaller than the sum of its proper divisors (33670164).

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

22521804 is a wasteful number, since it uses less digits than its factorization.

22521804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 22521804 is about 4745.7142771136. The cubic root of 22521804 is about 282.4019718877.

The spelling of 22521804 in words is "twenty-two million, five hundred twenty-one thousand, eight hundred four".