21359682844 has 24 divisors (see below), whose sum is σ = 39588590160. Its totient is φ = 10048985856.

The previous prime is 21359682829. The next prime is 21359682853. The reversal of 21359682844 is 44828695312.

It is a happy number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21359682791 and 21359682800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234214 + ... + 312370.

It is an arithmetic number, because the mean of its divisors is an integer number (1649524590).

Almost surely, 2^21359682844 is an apocalyptic number.

It is an amenable number.

21359682844 is a deficient number, since it is larger than the sum of its proper divisors (18228907316).

21359682844 is a wasteful number, since it uses less digits than its factorization.

21359682844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82197 (or 82195 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 52.

The spelling of 21359682844 in words is "twenty-one billion, three hundred fifty-nine million, six hundred eighty-two thousand, eight hundred forty-four".