21116864422216 has 16 divisors (see below), whose sum is σ = 39706285445100. Its totient is φ = 10528521636864.

The previous prime is 21116864422111. The next prime is 21116864422219. The reversal of 21116864422216 is 61222446861112.

It can be written as a sum of positive squares in 2 ways, for example, as 21020482736100 + 96381686116 = 4584810^2 + 310454^2 .

It is not an unprimeable number, because it can be changed into a prime (21116864422219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3738818781 + ... + 3738824428.

Almost surely, 2^{21116864422216} is an apocalyptic number.

It is an amenable number.

21116864422216 is a deficient number, since it is larger than the sum of its proper divisors (18589421022884).

21116864422216 is a wasteful number, since it uses less digits than its factorization.

21116864422216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7477643568 (or 7477643564 counting only the distinct ones).

The product of its digits is 442368, while the sum is 46.

The spelling of 21116864422216 in words is "twenty-one trillion, one hundred sixteen billion, eight hundred sixty-four million, four hundred twenty-two thousand, two hundred sixteen".