215253610321 has 2 divisors, whose sum is σ = 215253610322. Its totient is φ = 215253610320.

The previous prime is 215253610267. The next prime is 215253610339. The reversal of 215253610321 is 123016352512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214605195025 + 648415296 = 463255^2 + 25464^2 .

It is a cyclic number.

It is not a de Polignac number, because 215253610321 - 2⁷ = 215253610193 is a prime.

It is not a weakly prime, because it can be changed into another prime (215253616321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107626805160 + 107626805161.

It is an arithmetic number, because the mean of its divisors is an integer number (107626805161).

Almost surely, 2^215253610321 is an apocalyptic number.

It is an amenable number.

215253610321 is a deficient number, since it is larger than the sum of its proper divisors (1).

215253610321 is an equidigital number, since it uses as much as digits as its factorization.

215253610321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 215253610321 its reverse (123016352512), we get a palindrome (338269962833).

The spelling of 215253610321 in words is "two hundred fifteen billion, two hundred fifty-three million, six hundred ten thousand, three hundred twenty-one".