9434417821 has 2 divisors, whose sum is σ = 9434417822. Its totient is φ = 9434417820.

The previous prime is 9434417819. The next prime is 9434417849. The reversal of 9434417821 is 1287144349.

9434417821 is digitally balanced in base 2, 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., 9403180900 + 31236921 = 96970^2 + 5589^2 .

It is an emirp because it is prime and its reverse (1287144349) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9434417821 - 2¹ = 9434417819 is a prime.

Together with 9434417819, 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 (9434417221) 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 as a sum of consecutive naturals, namely, 4717208910 + 4717208911.

It is an arithmetic number, because the mean of its divisors is an integer number (4717208911).

Almost surely, 2^9434417821 is an apocalyptic number.

It is an amenable number.

9434417821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9434417821 is an equidigital number, since it uses as much as digits as its factorization.

9434417821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 9434417821 is about 97130.9313298292. The cubic root of 9434417821 is about 2113.0269457313.

The spelling of 9434417821 in words is "nine billion, four hundred thirty-four million, four hundred seventeen thousand, eight hundred twenty-one".