21549382 has 16 divisors (see below), whose sum is σ = 34191360. Its totient is φ = 10157832.

The previous prime is 21549301. The next prime is 21549389. The reversal of 21549382 is 28394512.

21549382 is nontrivially palindromic in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21549389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7203 + ... + 9745.

It is an arithmetic number, because the mean of its divisors is an integer number (2136960).

Almost surely, 2^21549382 is an apocalyptic number.

21549382 is a deficient number, since it is larger than the sum of its proper divisors (12641978).

21549382 is a wasteful number, since it uses less digits than its factorization.

21549382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787.

The product of its digits is 17280, while the sum is 34.

The square root of 21549382 is about 4642.1311915972. The cubic root of 21549382 is about 278.2776154699.

The spelling of 21549382 in words is "twenty-one million, five hundred forty-nine thousand, three hundred eighty-two".