21336522 has 8 divisors (see below), whose sum is σ = 42673056. Its totient is φ = 7112172.

The previous prime is 21336521. The next prime is 21336529. The reversal of 21336522 is 22563312.

It is a sphenic number, since it is the product of 3 distinct primes.

21336522 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21336492 and 21336501.

It is not an unprimeable number, because it can be changed into a prime (21336521) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1778038 + ... + 1778049.

It is an arithmetic number, because the mean of its divisors is an integer number (5334132).

Almost surely, 2^21336522 is an apocalyptic number.

21336522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21336522 is a wasteful number, since it uses less digits than its factorization.

21336522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556092.

The product of its digits is 2160, while the sum is 24.

The square root of 21336522 is about 4619.1473239116. The cubic root of 21336522 is about 277.3583271642.

Adding to 21336522 its reverse (22563312), we get a palindrome (43899834).

The spelling of 21336522 in words is "twenty-one million, three hundred thirty-six thousand, five hundred twenty-two".