21616543353516 has 24 divisors (see below), whose sum is σ = 50439050027520. Its totient is φ = 7205450326992.

The previous prime is 21616543353497. The next prime is 21616543353571. The reversal of 21616543353516 is 61535334561612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6600936 + ... + 9316943.

It is an arithmetic number, because the mean of its divisors is an integer number (2101627084480).

Almost surely, 2^{21616543353516} is an apocalyptic number.

It is an amenable number.

21616543353516 is an abundant number, since it is smaller than the sum of its proper divisors (28822506674004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21616543353516 is a wasteful number, since it uses less digits than its factorization.

21616543353516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16031053 (or 16031051 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 51.

The spelling of 21616543353516 in words is "twenty-one trillion, six hundred sixteen billion, five hundred forty-three million, three hundred fifty-three thousand, five hundred sixteen".