230721355217 has 4 divisors (see below), whose sum is σ = 230989949040. Its totient is φ = 230452761396.

The previous prime is 230721355181. The next prime is 230721355247. The reversal of 230721355217 is 712553127032.

230721355217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 230721355217 - 2²² = 230717160913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (230721355247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134295623 + ... + 134297340.

It is an arithmetic number, because the mean of its divisors is an integer number (57747487260).

Almost surely, 2^230721355217 is an apocalyptic number.

It is an amenable number.

230721355217 is a deficient number, since it is larger than the sum of its proper divisors (268593823).

230721355217 is an equidigital number, since it uses as much as digits as its factorization.

230721355217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268593822.

The product of its (nonzero) digits is 88200, while the sum is 38.

The spelling of 230721355217 in words is "two hundred thirty billion, seven hundred twenty-one million, three hundred fifty-five thousand, two hundred seventeen".