22521472 has 16 divisors (see below), whose sum is σ = 44867250. Its totient is φ = 11260672.

The previous prime is 22521461. The next prime is 22521497. The reversal of 22521472 is 27412522.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 9388096 = 3624^2 + 3064^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 87847 + ... + 88102.

Almost surely, 2^22521472 is an apocalyptic number.

It is an amenable number.

22521472 is a deficient number, since it is larger than the sum of its proper divisors (22345778).

22521472 is an equidigital number, since it uses as much as digits as its factorization.

22521472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175963 (or 175951 counting only the distinct ones).

The product of its digits is 2240, while the sum is 25.

The square root of 22521472 is about 4745.6792980563. The cubic root of 22521472 is about 282.4005842263.

Adding to 22521472 its reverse (27412522), we get a palindrome (49933994).

The spelling of 22521472 in words is "twenty-two million, five hundred twenty-one thousand, four hundred seventy-two".