21359209683834 has 96 divisors (see below), whose sum is σ = 52572479319360. Its totient is φ = 6445630598400.

The previous prime is 21359209683817. The next prime is 21359209683859. The reversal of 21359209683834 is 43838690295312.

21359209683834 is a `hidden beast` number, since 2 + 1 + 3 + 592 + 0 + 9 + 6 + 8 + 3 + 8 + 34 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7000749 + ... + 9577520.

It is an arithmetic number, because the mean of its divisors is an integer number (547629992910).

Almost surely, 2^{21359209683834} is an apocalyptic number.

21359209683834 is an abundant number, since it is smaller than the sum of its proper divisors (31213269635526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21359209683834 is a wasteful number, since it uses less digits than its factorization.

21359209683834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16578538 (or 16578526 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 63.

The spelling of 21359209683834 in words is "twenty-one trillion, three hundred fifty-nine billion, two hundred nine million, six hundred eighty-three thousand, eight hundred thirty-four".