21616216513235 has 32 divisors (see below), whose sum is σ = 26458989980544. Its totient is φ = 16948692864000.

The previous prime is 21616216513211. The next prime is 21616216513261. The reversal of 21616216513235 is 53231561261612.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21616216513235 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235962290 + ... + 236053880.

It is an arithmetic number, because the mean of its divisors is an integer number (826843436892).

Almost surely, 2^{21616216513235} is an apocalyptic number.

21616216513235 is a deficient number, since it is larger than the sum of its proper divisors (4842773467309).

21616216513235 is a wasteful number, since it uses less digits than its factorization.

21616216513235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94415.

The product of its digits is 388800, while the sum is 44.

Adding to 21616216513235 its reverse (53231561261612), we get a palindrome (74847777774847).

The spelling of 21616216513235 in words is "twenty-one trillion, six hundred sixteen billion, two hundred sixteen million, five hundred thirteen thousand, two hundred thirty-five".