30385021 has 2 divisors, whose sum is σ = 30385022. Its totient is φ = 30385020.

The previous prime is 30385007. The next prime is 30385027. The reversal of 30385021 is 12058303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29822521 + 562500 = 5461^2 + 750^2 .

It is an emirp because it is prime and its reverse (12058303) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30385021 - 2⁵ = 30384989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30384983 and 30385001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30385027) 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, 15192510 + 15192511.

It is an arithmetic number, because the mean of its divisors is an integer number (15192511).

Almost surely, 2^30385021 is an apocalyptic number.

It is an amenable number.

30385021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30385021 is an equidigital number, since it uses as much as digits as its factorization.

30385021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 30385021 is about 5512.2609698743. The cubic root of 30385021 is about 312.0468816523.

The spelling of 30385021 in words is "thirty million, three hundred eighty-five thousand, twenty-one".