21089382 has 8 divisors (see below), whose sum is σ = 42178776. Its totient is φ = 7029792.

The previous prime is 21089381. The next prime is 21089407. The reversal of 21089382 is 28398012.

It is a sphenic number, since it is the product of 3 distinct primes.

21089382 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21089381) 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 3 ways as a sum of consecutive naturals, for example, 1757443 + ... + 1757454.

It is an arithmetic number, because the mean of its divisors is an integer number (5272347).

Almost surely, 2^21089382 is an apocalyptic number.

21089382 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21089382 is a wasteful number, since it uses less digits than its factorization.

21089382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514902.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 21089382 is about 4592.3177154896. The cubic root of 21089382 is about 276.2832892597.

The spelling of 21089382 in words is "twenty-one million, eighty-nine thousand, three hundred eighty-two".