22521442 has 4 divisors (see below), whose sum is σ = 33782166. Its totient is φ = 11260720.

The previous prime is 22521437. The next prime is 22521451. The reversal of 22521442 is 24412522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20802721 + 1718721 = 4561^2 + 1311^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 5630359 + ... + 5630362.

Almost surely, 2^22521442 is an apocalyptic number.

22521442 is a deficient number, since it is larger than the sum of its proper divisors (11260724).

22521442 is a wasteful number, since it uses less digits than its factorization.

22521442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11260723.

The product of its digits is 1280, while the sum is 22.

The square root of 22521442 is about 4745.6761372854. The cubic root of 22521442 is about 282.4004588345.

Adding to 22521442 its reverse (24412522), we get a palindrome (46933964).

The spelling of 22521442 in words is "twenty-two million, five hundred twenty-one thousand, four hundred forty-two".