21382284 has 96 divisors (see below), whose sum is σ = 63254016. Its totient is φ = 5460480.

The previous prime is 21382271. The next prime is 21382297. The reversal of 21382284 is 48228312.

It is an interprime number because it is at equal distance from previous prime (21382271) and next prime (21382297).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67294 + ... + 67610.

It is an arithmetic number, because the mean of its divisors is an integer number (658896).

Almost surely, 2^21382284 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 21382284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31627008).

21382284 is an abundant number, since it is smaller than the sum of its proper divisors (41871732).

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

21382284 is a wasteful number, since it uses less digits than its factorization.

21382284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 413 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 21382284 is about 4624.0981823486. The cubic root of 21382284 is about 277.5564758036.

The spelling of 21382284 in words is "twenty-one million, three hundred eighty-two thousand, two hundred eighty-four".