9841830421 has 2 divisors, whose sum is σ = 9841830422. Its totient is φ = 9841830420.

The previous prime is 9841830419. The next prime is 9841830437. The reversal of 9841830421 is 1240381489.

9841830421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6639968196 + 3201862225 = 81486^2 + 56585^2 .

It is a cyclic number.

It is not a de Polignac number, because 9841830421 - 2¹ = 9841830419 is a prime.

Together with 9841830419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9841830461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4920915210 + 4920915211.

It is an arithmetic number, because the mean of its divisors is an integer number (4920915211).

Almost surely, 2^9841830421 is an apocalyptic number.

It is an amenable number.

9841830421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9841830421 is an equidigital number, since it uses as much as digits as its factorization.

9841830421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 9841830421 is about 99205.9999243997. Note that the first 4 decimals coincide. The cubic root of 9841830421 is about 2143.0154029999.

The spelling of 9841830421 in words is "nine billion, eight hundred forty-one million, eight hundred thirty thousand, four hundred twenty-one".