21042850636 has 24 divisors (see below), whose sum is σ = 37252928160. Its totient is φ = 10399247232.

The previous prime is 21042850559. The next prime is 21042850651. The reversal of 21042850636 is 63605824012.

It is a junction number, because it is equal to n+sod(n) for n = 21042850595 and 21042850604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071441 + ... + 1090903.

It is an arithmetic number, because the mean of its divisors is an integer number (1552205340).

Almost surely, 2^21042850636 is an apocalyptic number.

It is an amenable number.

21042850636 is a deficient number, since it is larger than the sum of its proper divisors (16210077524).

21042850636 is a wasteful number, since it uses less digits than its factorization.

21042850636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22593 (or 22591 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 21042850636 in words is "twenty-one billion, forty-two million, eight hundred fifty thousand, six hundred thirty-six".