216312266721 has 8 divisors (see below), whose sum is σ = 288418534720. Its totient is φ = 144207088272.

The previous prime is 216312266701. The next prime is 216312266741. The reversal of 216312266721 is 127662213612.

It is an interprime number because it is at equal distance from previous prime (216312266701) and next prime (216312266741).

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

It is not a de Polignac number, because 216312266721 - 2¹¹ = 216312264673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216312266721.

It is not an unprimeable number, because it can be changed into a prime (216312266701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520956 + ... + 839058.

It is an arithmetic number, because the mean of its divisors is an integer number (36052316840).

Almost surely, 2^216312266721 is an apocalyptic number.

It is an amenable number.

216312266721 is a deficient number, since it is larger than the sum of its proper divisors (72106267999).

216312266721 is a wasteful number, since it uses less digits than its factorization.

216312266721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544775.

The product of its digits is 72576, while the sum is 39.

The spelling of 216312266721 in words is "two hundred sixteen billion, three hundred twelve million, two hundred sixty-six thousand, seven hundred twenty-one".