21705335383534 has 48 divisors (see below), whose sum is σ = 36463903476336. Its totient is φ = 9679436074880.

The previous prime is 21705335383531. The next prime is 21705335383547. The reversal of 21705335383534 is 43538353350712.

It is a super-2 number, since 2×21705335383534² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21705335383531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 473551482 + ... + 473597314.

It is an arithmetic number, because the mean of its divisors is an integer number (759664655757).

Almost surely, 2^{21705335383534} is an apocalyptic number.

21705335383534 is a deficient number, since it is larger than the sum of its proper divisors (14758568092802).

21705335383534 is a wasteful number, since it uses less digits than its factorization.

21705335383534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82833 (or 82822 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 52.

The spelling of 21705335383534 in words is "twenty-one trillion, seven hundred five billion, three hundred thirty-five million, three hundred eighty-three thousand, five hundred thirty-four".