21363536 has 20 divisors (see below), whose sum is σ = 41893152. Its totient is φ = 10552416.

The previous prime is 21363497. The next prime is 21363593. The reversal of 21363536 is 63536312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21363499 and 21363508.

It is a congruent 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 in 3 ways as a sum of consecutive naturals, for example, 6716 + ... + 9371.

Almost surely, 2^21363536 is an apocalyptic number.

It is an amenable number.

21363536 is a deficient number, since it is larger than the sum of its proper divisors (20529616).

21363536 is a wasteful number, since it uses less digits than its factorization.

21363536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16178 (or 16172 counting only the distinct ones).

The product of its digits is 9720, while the sum is 29.

The square root of 21363536 is about 4622.0705316990. The cubic root of 21363536 is about 277.4753315192.

Adding to 21363536 its reverse (63536312), we get a palindrome (84899848).

The spelling of 21363536 in words is "twenty-one million, three hundred sixty-three thousand, five hundred thirty-six".