921085709999 has 24 divisors (see below), whose sum is σ = 1170139588128. Its totient is φ = 718506694080.

The previous prime is 921085709989. The next prime is 921085710011. The reversal of 921085709999 is 999907580129.

It is a de Polignac number, because none of the positive numbers 2^k-921085709999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921085709939) 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, 10137692 + ... + 10228145.

It is an arithmetic number, because the mean of its divisors is an integer number (48755816172).

Almost surely, 2^921085709999 is an apocalyptic number.

921085709999 is a deficient number, since it is larger than the sum of its proper divisors (249053878129).

921085709999 is a wasteful number, since it uses less digits than its factorization.

921085709999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20365935 (or 20365928 counting only the distinct ones).

The product of its (nonzero) digits is 33067440, while the sum is 68.

The spelling of 921085709999 in words is "nine hundred twenty-one billion, eighty-five million, seven hundred nine thousand, nine hundred ninety-nine".