9749985021 has 12 divisors (see below), whose sum is σ = 16095213472. Its totient is φ = 5571419976.

The previous prime is 9749985013. The next prime is 9749985023. The reversal of 9749985021 is 1205899479.

9749985021 is a `hidden beast` number, since 9 + 7 + 49 + 98 + 502 + 1 = 666.

It is not a de Polignac number, because 9749985021 - 2³ = 9749985013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9749985023) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 77380771 + ... + 77380896.

Almost surely, 2^9749985021 is an apocalyptic number.

It is an amenable number.

9749985021 is a deficient number, since it is larger than the sum of its proper divisors (6345228451).

9749985021 is a wasteful number, since it uses less digits than its factorization.

9749985021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154761680 (or 154761677 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The square root of 9749985021 is about 98742.0124415135. The cubic root of 9749985021 is about 2136.3282468287.

The spelling of 9749985021 in words is "nine billion, seven hundred forty-nine million, nine hundred eighty-five thousand, twenty-one".