30121321 has 2 divisors, whose sum is σ = 30121322. Its totient is φ = 30121320.

The previous prime is 30121319. The next prime is 30121349. The reversal of 30121321 is 12312103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22695696 + 7425625 = 4764^2 + 2725^2 .

It is an emirp because it is prime and its reverse (12312103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30121321 - 2¹ = 30121319 is a prime.

Together with 30121319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30121361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060660 + 15060661.

It is an arithmetic number, because the mean of its divisors is an integer number (15060661).

Almost surely, 2^30121321 is an apocalyptic number.

It is an amenable number.

30121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121321 is an equidigital number, since it uses as much as digits as its factorization.

30121321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 30121321 is about 5488.2894420757. The cubic root of 30121321 is about 311.1415456290.

Adding to 30121321 its reverse (12312103), we get a palindrome (42433424).

The spelling of 30121321 in words is "thirty million, one hundred twenty-one thousand, three hundred twenty-one".