21830328 has 96 divisors (see below), whose sum is σ = 64668240. Its totient is φ = 6612480.

The previous prime is 21830317. The next prime is 21830339. The reversal of 21830328 is 82303812.

It is an interprime number because it is at equal distance from previous prime (21830317) and next prime (21830339).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77548 + ... + 77828.

Almost surely, 2^21830328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21830328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32334120).

21830328 is an abundant number, since it is smaller than the sum of its proper divisors (42837912).

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

21830328 is a wasteful number, since it uses less digits than its factorization.

21830328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 382 counting only the distinct ones).

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

The square root of 21830328 is about 4672.2936551548. The cubic root of 21830328 is about 279.4817283614.

The spelling of 21830328 in words is "twenty-one million, eight hundred thirty thousand, three hundred twenty-eight".