9804020421 has 16 divisors (see below), whose sum is σ = 14287684544. Its totient is φ = 5943193344.

The previous prime is 9804020417. The next prime is 9804020431. The reversal of 9804020421 is 1240204089.

9804020421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9804020421 - 2² = 9804020417 is a prime.

It is a super-2 number, since 2×9804020421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9804020431) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1873396 + ... + 1878621.

It is an arithmetic number, because the mean of its divisors is an integer number (892980284).

Almost surely, 2^9804020421 is an apocalyptic number.

It is an amenable number.

9804020421 is a deficient number, since it is larger than the sum of its proper divisors (4483664123).

9804020421 is a wasteful number, since it uses less digits than its factorization.

9804020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752100.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 9804020421 is about 99015.2534764215. The cubic root of 9804020421 is about 2140.2675605862.

The spelling of 9804020421 in words is "nine billion, eight hundred four million, twenty thousand, four hundred twenty-one".