216021368 has 8 divisors (see below), whose sum is σ = 405040080. Its totient is φ = 108010680.

The previous prime is 216021367. The next prime is 216021371. The reversal of 216021368 is 863120612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 216021368.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216021367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13501328 + ... + 13501343.

It is an arithmetic number, because the mean of its divisors is an integer number (50630010).

Almost surely, 2^216021368 is an apocalyptic number.

It is an amenable number.

216021368 is a deficient number, since it is larger than the sum of its proper divisors (189018712).

216021368 is a wasteful number, since it uses less digits than its factorization.

216021368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27002677 (or 27002673 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 216021368 is about 14697.6653928439. The cubic root of 216021368 is about 600.0197845328.

The spelling of 216021368 in words is "two hundred sixteen million, twenty-one thousand, three hundred sixty-eight".