21363044 has 12 divisors (see below), whose sum is σ = 39010944. Its totient is φ = 10217064.

The previous prime is 21363037. The next prime is 21363047. The reversal of 21363044 is 44036312.

It is a happy number.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21363047) 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 in 3 ways as a sum of consecutive naturals, for example, 116012 + ... + 116195.

It is an arithmetic number, because the mean of its divisors is an integer number (3250912).

Almost surely, 2^21363044 is an apocalyptic number.

It is an amenable number.

21363044 is a deficient number, since it is larger than the sum of its proper divisors (17647900).

21363044 is a wasteful number, since it uses less digits than its factorization.

21363044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232234 (or 232232 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 21363044 is about 4622.0173084920. The cubic root of 21363044 is about 277.4732014269.

Adding to 21363044 its reverse (44036312), we get a palindrome (65399356).

The spelling of 21363044 in words is "twenty-one million, three hundred sixty-three thousand, forty-four".