216165003536421 has 12 divisors (see below), whose sum is σ = 325813918374048. Its totient is φ = 137844350081064.

The previous prime is 216165003536401. The next prime is 216165003536437. The reversal of 216165003536421 is 124635300561612.

It is a happy number.

216165003536421 is a `hidden beast` number, since 2 + 1 + 6 + 16 + 500 + 3 + 53 + 64 + 21 = 666.

216165003536421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216165003536421 - 2¹⁸ = 216165003274277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216165003536401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522137689495 + ... + 522137689908.

It is an arithmetic number, because the mean of its divisors is an integer number (27151159864504).

Almost surely, 2^{216165003536421} is an apocalyptic number.

It is an amenable number.

216165003536421 is a deficient number, since it is larger than the sum of its proper divisors (109648914837627).

216165003536421 is a wasteful number, since it uses less digits than its factorization.

216165003536421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044275379432 (or 1044275379429 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 216165003536421 in words is "two hundred sixteen trillion, one hundred sixty-five billion, three million, five hundred thirty-six thousand, four hundred twenty-one".