21435866683 has 36 divisors (see below), whose sum is σ = 27466266240. Its totient is φ = 16668109920.

The previous prime is 21435866659. The next prime is 21435866687. The reversal of 21435866683 is 38666853412.

It is not a de Polignac number, because 21435866683 - 2²⁵ = 21402312251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21435866683.

It is not an unprimeable number, because it can be changed into a prime (21435866687) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 3014310 + ... + 3021412.

It is an arithmetic number, because the mean of its divisors is an integer number (762951840).

Almost surely, 2^21435866683 is an apocalyptic number.

21435866683 is a deficient number, since it is larger than the sum of its proper divisors (6030399557).

21435866683 is a wasteful number, since it uses less digits than its factorization.

21435866683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7648 (or 7630 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 52.

The spelling of 21435866683 in words is "twenty-one billion, four hundred thirty-five million, eight hundred sixty-six thousand, six hundred eighty-three".