21363244 has 12 divisors (see below), whose sum is σ = 42726544. Its totient is φ = 9155664.

The previous prime is 21363193. The next prime is 21363253. The reversal of 21363244 is 44236312.

21363244 is an admirable 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, 381459 + ... + 381514.

Almost surely, 2^21363244 is an apocalyptic number.

It is an amenable number.

21363244 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.

21363244 is a wasteful number, since it uses less digits than its factorization.

21363244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762984 (or 762982 counting only the distinct ones).

The product of its digits is 3456, while the sum is 25.

The square root of 21363244 is about 4622.0389440159. The cubic root of 21363244 is about 277.4740673221.

Adding to 21363244 its reverse (44236312), we get a palindrome (65599556).

The spelling of 21363244 in words is "twenty-one million, three hundred sixty-three thousand, two hundred forty-four".