9910021 has 6 divisors (see below), whose sum is σ = 10892966. Its totient is φ = 9009000.

The previous prime is 9910013. The next prime is 9910063. The reversal of 9910021 is 1200199.

9910021 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 only one way, i.e., 9828225 + 81796 = 3135^2 + 286^2 .

It is not a de Polignac number, because 9910021 - 2³ = 9910013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9909974 and 9910001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9910921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40830 + ... + 41071.

Almost surely, 2^9910021 is an apocalyptic number.

It is an amenable number.

9910021 is a deficient number, since it is larger than the sum of its proper divisors (982945).

9910021 is a wasteful number, since it uses less digits than its factorization.

9910021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81923 (or 81912 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 9910021 is about 3148.0185831726. The cubic root of 9910021 is about 214.7953415735.

The spelling of 9910021 in words is "nine million, nine hundred ten thousand, twenty-one".