21824316 has 36 divisors (see below), whose sum is σ = 57212792. Its totient is φ = 7274448.

The previous prime is 21824291. The next prime is 21824317. The reversal of 21824316 is 61342812.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21824316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21824317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10255 + ... + 12198.

Almost surely, 2^21824316 is an apocalyptic number.

It is an amenable number.

21824316 is an abundant number, since it is smaller than the sum of its proper divisors (35388476).

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

21824316 is a wasteful number, since it uses less digits than its factorization.

21824316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22472 (or 22458 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21824316 is about 4671.6502437576. The cubic root of 21824316 is about 279.4560698918.

The spelling of 21824316 in words is "twenty-one million, eight hundred twenty-four thousand, three hundred sixteen".