21824396 has 48 divisors (see below), whose sum is σ = 44634240. Its totient is φ = 9227520.

The previous prime is 21824381. The next prime is 21824417. The reversal of 21824396 is 69342812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121835 + ... + 122013.

It is an arithmetic number, because the mean of its divisors is an integer number (929880).

Almost surely, 2^21824396 is an apocalyptic number.

It is an amenable number.

21824396 is an abundant number, since it is smaller than the sum of its proper divisors (22809844).

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

21824396 is a wasteful number, since it uses less digits than its factorization.

21824396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 372 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 21824396 is about 4671.6588060345. The cubic root of 21824396 is about 279.4564113528.

The spelling of 21824396 in words is "twenty-one million, eight hundred twenty-four thousand, three hundred ninety-six".