21671017708 has 12 divisors (see below), whose sum is σ = 38806241320. Its totient is φ = 10583520192.

The previous prime is 21671017661. The next prime is 21671017723. The reversal of 21671017708 is 80771017612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62996973 + ... + 62997316.

Almost surely, 2^21671017708 is an apocalyptic number.

It is an amenable number.

21671017708 is a deficient number, since it is larger than the sum of its proper divisors (17135223612).

21671017708 is a wasteful number, since it uses less digits than its factorization.

21671017708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125994336 (or 125994334 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 40.

The spelling of 21671017708 in words is "twenty-one billion, six hundred seventy-one million, seventeen thousand, seven hundred eight".