30109421 has 2 divisors, whose sum is σ = 30109422. Its totient is φ = 30109420.

The previous prime is 30109393. The next prime is 30109423. The reversal of 30109421 is 12490103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 13225 = 5486^2 + 115^2 .

It is an emirp because it is prime and its reverse (12490103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30109421 - 2²² = 25915117 is a prime.

It is a Sophie Germain prime.

Together with 30109423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30109393 and 30109402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30109423) 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, 15054710 + 15054711.

It is an arithmetic number, because the mean of its divisors is an integer number (15054711).

Almost surely, 2^30109421 is an apocalyptic number.

It is an amenable number.

30109421 is a deficient number, since it is larger than the sum of its proper divisors (1).

30109421 is an equidigital number, since it uses as much as digits as its factorization.

30109421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 30109421 is about 5487.2052084827. The cubic root of 30109421 is about 311.1005661061.

Adding to 30109421 its reverse (12490103), we get a palindrome (42599524).

The spelling of 30109421 in words is "thirty million, one hundred nine thousand, four hundred twenty-one".