15305420321 has 2 divisors, whose sum is σ = 15305420322. Its totient is φ = 15305420320.

The previous prime is 15305420281. The next prime is 15305420323. The reversal of 15305420321 is 12302450351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15298968721 + 6451600 = 123689^2 + 2540^2 .

It is an emirp because it is prime and its reverse (12302450351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15305420321 - 2⁶ = 15305420257 is a prime.

Together with 15305420323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15305420323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7652710160 + 7652710161.

It is an arithmetic number, because the mean of its divisors is an integer number (7652710161).

Almost surely, 2^15305420321 is an apocalyptic number.

It is an amenable number.

15305420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

15305420321 is an equidigital number, since it uses as much as digits as its factorization.

15305420321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 15305420321 its reverse (12302450351), we get a palindrome (27607870672).

The spelling of 15305420321 in words is "fifteen billion, three hundred five million, four hundred twenty thousand, three hundred twenty-one".