9901020012021 has 24 divisors (see below), whose sum is σ = 14364603747000. Its totient is φ = 6571545628032.

The previous prime is 9901020011879. The next prime is 9901020012071. The reversal of 9901020012021 is 1202100201099.

9901020012021 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 4 ways, for example, as 23111600625 + 9877908411396 = 152025^2 + 3142914^2 .

It is not a de Polignac number, because 9901020012021 - 2³⁷ = 9763581058549 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901020012071) 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, 48597715 + ... + 48801023.

It is an arithmetic number, because the mean of its divisors is an integer number (598525156125).

Almost surely, 2^{9901020012021} is an apocalyptic number.

It is an amenable number.

9901020012021 is a deficient number, since it is larger than the sum of its proper divisors (4463583734979).

9901020012021 is a wasteful number, since it uses less digits than its factorization.

9901020012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227173 (or 227170 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 9901020012021 in words is "nine trillion, nine hundred one billion, twenty million, twelve thousand, twenty-one".