21220336 has 10 divisors (see below), whose sum is σ = 41114432. Its totient is φ = 10610160.

The previous prime is 21220333. The next prime is 21220349. The reversal of 21220336 is 63302212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220333) 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, 663120 + ... + 663151.

Almost surely, 2^21220336 is an apocalyptic number.

It is an amenable number.

21220336 is a deficient number, since it is larger than the sum of its proper divisors (19894096).

21220336 is a wasteful number, since it uses less digits than its factorization.

21220336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326279 (or 1326273 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21220336 is about 4606.5535924376. The cubic root of 21220336 is about 276.8539677814.

Adding to 21220336 its reverse (63302212), we get a palindrome (84522548).

The spelling of 21220336 in words is "twenty-one million, two hundred twenty thousand, three hundred thirty-six".