21524422 has 4 divisors (see below), whose sum is σ = 32286636. Its totient is φ = 10762210.

The previous prime is 21524401. The next prime is 21524423. The reversal of 21524422 is 22442512.

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

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 a junction number, because it is equal to n+sod(n) for n = 21524393 and 21524402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524423) by changing a digit.

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, 5381104 + ... + 5381107.

It is an arithmetic number, because the mean of its divisors is an integer number (8071659).

Almost surely, 2^21524422 is an apocalyptic number.

21524422 is a deficient number, since it is larger than the sum of its proper divisors (10762214).

21524422 is a wasteful number, since it uses less digits than its factorization.

21524422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10762213.

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

The square root of 21524422 is about 4639.4419923090. The cubic root of 21524422 is about 278.1701337686.

Adding to 21524422 its reverse (22442512), we get a palindrome (43966934).

The spelling of 21524422 in words is "twenty-one million, five hundred twenty-four thousand, four hundred twenty-two".