21616216513305 has 32 divisors (see below), whose sum is σ = 34800903096960. Its totient is φ = 11457007856640.

The previous prime is 21616216513277. The next prime is 21616216513327. The reversal of 21616216513305 is 50331561261612.

It is a happy number.

It is not a de Polignac number, because 21616216513305 - 2¹⁰ = 21616216512281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30903681 + ... + 31595409.

It is an arithmetic number, because the mean of its divisors is an integer number (1087528221780).

Almost surely, 2^{21616216513305} is an apocalyptic number.

It is an amenable number.

21616216513305 is a deficient number, since it is larger than the sum of its proper divisors (13184686583655).

21616216513305 is a wasteful number, since it uses less digits than its factorization.

21616216513305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704681.

The product of its (nonzero) digits is 194400, while the sum is 42.

Adding to 21616216513305 its reverse (50331561261612), we get a palindrome (71947777774917).

The spelling of 21616216513305 in words is "twenty-one trillion, six hundred sixteen billion, two hundred sixteen million, five hundred thirteen thousand, three hundred five".