216721869438033 has 24 divisors (see below), whose sum is σ = 316572946241760. Its totient is φ = 142852034445120.

The previous prime is 216721869438001. The next prime is 216721869438047. The reversal of 216721869438033 is 330834968127612.

It is a happy number.

216721869438033 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 218 + 6 + 9 + 4 + 380 + 33 = 666.

It is not a de Polignac number, because 216721869438033 - 2⁵ = 216721869438001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216721869438073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14175610 + ... + 25187132.

It is an arithmetic number, because the mean of its divisors is an integer number (13190539426740).

Almost surely, 2^{216721869438033} is an apocalyptic number.

It is an amenable number.

216721869438033 is a deficient number, since it is larger than the sum of its proper divisors (99851076803727).

216721869438033 is a wasteful number, since it uses less digits than its factorization.

216721869438033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11036189 (or 11036186 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 63.

The spelling of 216721869438033 in words is "two hundred sixteen trillion, seven hundred twenty-one billion, eight hundred sixty-nine million, four hundred thirty-eight thousand, thirty-three".