9985421 has 2 divisors, whose sum is σ = 9985422. Its totient is φ = 9985420.

The previous prime is 9985403. The next prime is 9985429. The reversal of 9985421 is 1245899.

9985421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5929225 + 4056196 = 2435^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 9985421 - 2¹⁰ = 9984397 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9985429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4992710 + 4992711.

It is an arithmetic number, because the mean of its divisors is an integer number (4992711).

Almost surely, 2^9985421 is an apocalyptic number.

It is an amenable number.

9985421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9985421 is an equidigital number, since it uses as much as digits as its factorization.

9985421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 9985421 is about 3159.9716770883. The cubic root of 9985421 is about 215.3387197375.

The spelling of 9985421 in words is "nine million, nine hundred eighty-five thousand, four hundred twenty-one".