21716382 has 8 divisors (see below), whose sum is σ = 43432776. Its totient is φ = 7238792.

The previous prime is 21716381. The next prime is 21716407. The reversal of 21716382 is 28361712.

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

21716382 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1809693 + ... + 1809704.

It is an arithmetic number, because the mean of its divisors is an integer number (5429097).

Almost surely, 2^21716382 is an apocalyptic number.

21716382 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.

21716382 is a wasteful number, since it uses less digits than its factorization.

21716382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619402.

The product of its digits is 4032, while the sum is 30.

The square root of 21716382 is about 4660.0839048240. The cubic root of 21716382 is about 278.9946171287.

The spelling of 21716382 in words is "twenty-one million, seven hundred sixteen thousand, three hundred eighty-two".