9394880021 has 2 divisors, whose sum is σ = 9394880022. Its totient is φ = 9394880020.

The previous prime is 9394879999. The next prime is 9394880029. The reversal of 9394880021 is 1200884939.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5389762225 + 4005117796 = 73415^2 + 63286^2 .

It is a cyclic number.

It is not a de Polignac number, because 9394880021 - 2⁶ = 9394879957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9394880029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4697440010 + 4697440011.

It is an arithmetic number, because the mean of its divisors is an integer number (4697440011).

Almost surely, 2^9394880021 is an apocalyptic number.

It is an amenable number.

9394880021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9394880021 is an equidigital number, since it uses as much as digits as its factorization.

9394880021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 9394880021 is about 96927.1892762810. The cubic root of 9394880021 is about 2110.0710517916.

The spelling of 9394880021 in words is "nine billion, three hundred ninety-four million, eight hundred eighty thousand, twenty-one".