9810021 has 8 divisors (see below), whose sum is σ = 14086240. Its totient is φ = 6036912.

The previous prime is 9810007. The next prime is 9810049. The reversal of 9810021 is 1200189.

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

It is not a de Polignac number, because 9810021 - 2⁷ = 9809893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9810021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9810001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125731 + ... + 125808.

It is an arithmetic number, because the mean of its divisors is an integer number (1760780).

Almost surely, 2^9810021 is an apocalyptic number.

It is an amenable number.

9810021 is a deficient number, since it is larger than the sum of its proper divisors (4276219).

9810021 is a wasteful number, since it uses less digits than its factorization.

9810021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251555.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 9810021 is about 3132.0953050634. The cubic root of 9810021 is about 214.0704123845.

The spelling of 9810021 in words is "nine million, eight hundred ten thousand, twenty-one".