21386382 has 8 divisors (see below), whose sum is σ = 42772776. Its totient is φ = 7128792.

The previous prime is 21386359. The next prime is 21386399. The reversal of 21386382 is 28368312.

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

21386382 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 1782193 + ... + 1782204.

It is an arithmetic number, because the mean of its divisors is an integer number (5346597).

Almost surely, 2^21386382 is an apocalyptic number.

21386382 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.

21386382 is a wasteful number, since it uses less digits than its factorization.

21386382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564402.

The product of its digits is 13824, while the sum is 33.

The square root of 21386382 is about 4624.5412745482. The cubic root of 21386382 is about 277.5742062727.

The spelling of 21386382 in words is "twenty-one million, three hundred eighty-six thousand, three hundred eighty-two".