216535013241721 has 8 divisors (see below), whose sum is σ = 216870288171264. Its totient is φ = 216199749550800.

The previous prime is 216535013241713. The next prime is 216535013241727. The reversal of 216535013241721 is 127142310535612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216535013241721 - 2³ = 216535013241713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216535013241727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36172600 + ... + 41731606.

It is an arithmetic number, because the mean of its divisors is an integer number (27108786021408).

Almost surely, 2^{216535013241721} is an apocalyptic number.

It is an amenable number.

216535013241721 is a deficient number, since it is larger than the sum of its proper divisors (335274929543).

216535013241721 is an equidigital number, since it uses as much as digits as its factorization.

216535013241721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5619311.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 216535013241721 in words is "two hundred sixteen trillion, five hundred thirty-five billion, thirteen million, two hundred forty-one thousand, seven hundred twenty-one".