385330021 has 2 divisors, whose sum is σ = 385330022. Its totient is φ = 385330020.

The previous prime is 385329983. The next prime is 385330027. The reversal of 385330021 is 120033583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378497025 + 6832996 = 19455^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 385330021 - 2⁹ = 385329509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385330027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192665010 + 192665011.

It is an arithmetic number, because the mean of its divisors is an integer number (192665011).

Almost surely, 2^385330021 is an apocalyptic number.

It is an amenable number.

385330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

385330021 is an equidigital number, since it uses as much as digits as its factorization.

385330021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 385330021 is about 19629.8247827127. The cubic root of 385330021 is about 727.6864397793.

The spelling of 385330021 in words is "three hundred eighty-five million, three hundred thirty thousand, twenty-one".