9225280021 has 2 divisors, whose sum is σ = 9225280022. Its totient is φ = 9225280020.

The previous prime is 9225279997. The next prime is 9225280033. The reversal of 9225280021 is 1200825229.

9225280021 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., 7594251025 + 1631028996 = 87145^2 + 40386^2 .

It is an emirp because it is prime and its reverse (1200825229) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9225280021 - 2⁹ = 9225279509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9225280091) 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, 4612640010 + 4612640011.

It is an arithmetic number, because the mean of its divisors is an integer number (4612640011).

Almost surely, 2^9225280021 is an apocalyptic number.

It is an amenable number.

9225280021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9225280021 is an equidigital number, since it uses as much as digits as its factorization.

9225280021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 9225280021 is about 96048.3212815300. The cubic root of 9225280021 is about 2097.2965984856.

The spelling of 9225280021 in words is "nine billion, two hundred twenty-five million, two hundred eighty thousand, twenty-one".