21616231221416 has 64 divisors (see below), whose sum is σ = 45906281003520. Its totient is φ = 9472724501760.

The previous prime is 21616231221407. The next prime is 21616231221421. The reversal of 21616231221416 is 61412213261612.

It is a super-2 number, since 2×21616231221416² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21616231221416.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63081830 + ... + 63423573.

It is an arithmetic number, because the mean of its divisors is an integer number (717285640680).

Almost surely, 2^{21616231221416} is an apocalyptic number.

21616231221416 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21616231221416 is an abundant number, since it is smaller than the sum of its proper divisors (24290049782104).

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

21616231221416 is a wasteful number, since it uses less digits than its factorization.

21616231221416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126505506 (or 126505502 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The spelling of 21616231221416 in words is "twenty-one trillion, six hundred sixteen billion, two hundred thirty-one million, two hundred twenty-one thousand, four hundred sixteen".