216565122011 has 16 divisors (see below), whose sum is σ = 250960457664. Its totient is φ = 183035510784.

The previous prime is 216565121999. The next prime is 216565122013. The reversal of 216565122011 is 110221565612.

216565122011 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 216565122011 - 2¹⁸ = 216564859867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216565122013) 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 15 ways as a sum of consecutive naturals, for example, 1926491 + ... + 2035803.

It is an arithmetic number, because the mean of its divisors is an integer number (15685028604).

Almost surely, 2^216565122011 is an apocalyptic number.

216565122011 is a deficient number, since it is larger than the sum of its proper divisors (34395335653).

216565122011 is a wasteful number, since it uses less digits than its factorization.

216565122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113270.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 216565122011 its reverse (110221565612), we get a palindrome (326786687623).

The spelling of 216565122011 in words is "two hundred sixteen billion, five hundred sixty-five million, one hundred twenty-two thousand, eleven".