21313382 has 8 divisors (see below), whose sum is σ = 32253336. Its totient is φ = 10562272.

The previous prime is 21313379. The next prime is 21313429. The reversal of 21313382 is 28331312.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46928 + ... + 47379.

It is an arithmetic number, because the mean of its divisors is an integer number (4031667).

Almost surely, 2^21313382 is an apocalyptic number.

21313382 is a deficient number, since it is larger than the sum of its proper divisors (10939954).

21313382 is a wasteful number, since it uses less digits than its factorization.

21313382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94422.

The product of its digits is 864, while the sum is 23.

The square root of 21313382 is about 4616.6418531222. The cubic root of 21313382 is about 277.2580235116.

Adding to 21313382 its reverse (28331312), we get a palindrome (49644694).

The spelling of 21313382 in words is "twenty-one million, three hundred thirteen thousand, three hundred eighty-two".