9891211012 has 12 divisors (see below), whose sum is σ = 17335192140. Its totient is φ = 4938298976.

The previous prime is 9891210941. The next prime is 9891211027. The reversal of 9891211012 is 2101121989.

9891211012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9837862596 + 53348416 = 99186^2 + 7304^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1823587 + ... + 1829002.

It is an arithmetic number, because the mean of its divisors is an integer number (1444599345).

Almost surely, 2^9891211012 is an apocalyptic number.

It is an amenable number.

9891211012 is a deficient number, since it is larger than the sum of its proper divisors (7443981128).

9891211012 is a wasteful number, since it uses less digits than its factorization.

9891211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653270 (or 3653268 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 9891211012 is about 99454.5675773617. The cubic root of 9891211012 is about 2146.5935609767.

The spelling of 9891211012 in words is "nine billion, eight hundred ninety-one million, two hundred eleven thousand, twelve".