215304021305 has 16 divisors (see below), whose sum is σ = 274504697280. Its totient is φ = 161652750912.

The previous prime is 215304021287. The next prime is 215304021319. The reversal of 215304021305 is 503120403512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 215304021305 - 2³⁰ = 214230279481 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 10580294 + ... + 10600623.

It is an arithmetic number, because the mean of its divisors is an integer number (17156543580).

Almost surely, 2^215304021305 is an apocalyptic number.

It is an amenable number.

215304021305 is a deficient number, since it is larger than the sum of its proper divisors (59200675975).

215304021305 is a wasteful number, since it uses less digits than its factorization.

215304021305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21181048.

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

Adding to 215304021305 its reverse (503120403512), we get a palindrome (718424424817).

The spelling of 215304021305 in words is "two hundred fifteen billion, three hundred four million, twenty-one thousand, three hundred five".