21821856382 has 8 divisors (see below), whose sum is σ = 32733666000. Its totient is φ = 10910634384.

The previous prime is 21821856271. The next prime is 21821856431. The reversal of 21821856382 is 28365812812.

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37882 + ... + 212317.

It is an arithmetic number, because the mean of its divisors is an integer number (4091708250).

Almost surely, 2^21821856382 is an apocalyptic number.

21821856382 is a deficient number, since it is larger than the sum of its proper divisors (10911809618).

21821856382 is a wasteful number, since it uses less digits than its factorization.

21821856382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293810.

The product of its digits is 368640, while the sum is 46.

The spelling of 21821856382 in words is "twenty-one billion, eight hundred twenty-one million, eight hundred fifty-six thousand, three hundred eighty-two".