21136336 has 40 divisors (see below), whose sum is σ = 44379104. Its totient is φ = 9694080.

The previous prime is 21136319. The next prime is 21136369. The reversal of 21136336 is 63363112.

It is a self number, because there is not a number n which added to its sum of digits gives 21136336.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63691 + ... + 64021.

Almost surely, 2^21136336 is an apocalyptic number.

21136336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21136336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22189552).

21136336 is an abundant number, since it is smaller than the sum of its proper divisors (23242768).

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

21136336 is a wasteful number, since it uses less digits than its factorization.

21136336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 653 counting only the distinct ones).

The product of its digits is 1944, while the sum is 25.

The square root of 21136336 is about 4597.4271065456. The cubic root of 21136336 is about 276.4881789356.

Adding to 21136336 its reverse (63363112), we get a palindrome (84499448).

The spelling of 21136336 in words is "twenty-one million, one hundred thirty-six thousand, three hundred thirty-six".