216243354312 has 24 divisors (see below), whose sum is σ = 585659084790. Its totient is φ = 72081118080.

The previous prime is 216243354311. The next prime is 216243354343. The reversal of 216243354312 is 213453342612.

216243354312 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 4 + 335 + 4 + 312 = 666.

216243354312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 204671188836 + 11572165476 = 452406^2 + 107574^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×216243354312² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (216243354311) 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 5 ways as a sum of consecutive naturals, for example, 1501689889 + ... + 1501690032.

Almost surely, 2^216243354312 is an apocalyptic number.

It is an amenable number.

216243354312 is an abundant number, since it is smaller than the sum of its proper divisors (369415730478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216243354312 is a wasteful number, since it uses less digits than its factorization.

216243354312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003379933 (or 3003379926 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

Adding to 216243354312 its reverse (213453342612), we get a palindrome (429696696924).

The spelling of 216243354312 in words is "two hundred sixteen billion, two hundred forty-three million, three hundred fifty-four thousand, three hundred twelve".