9957021 has 8 divisors (see below), whose sum is σ = 13346304. Its totient is φ = 6602880.

The previous prime is 9957001. The next prime is 9957029. The reversal of 9957021 is 1207599.

9957021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9957021 - 2¹⁸ = 9694877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9957029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8116 + ... + 9261.

It is an arithmetic number, because the mean of its divisors is an integer number (1668288).

Almost surely, 2^9957021 is an apocalyptic number.

It is an amenable number.

9957021 is a deficient number, since it is larger than the sum of its proper divisors (3389283).

9957021 is a wasteful number, since it uses less digits than its factorization.

9957021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17571.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 9957021 is about 3155.4747661802. The cubic root of 9957021 is about 215.1343742648.

The spelling of 9957021 in words is "nine million, nine hundred fifty-seven thousand, twenty-one".