21266411666116 has 12 divisors (see below), whose sum is σ = 38222064210988. Its totient is φ = 10345821891552.

The previous prime is 21266411666113. The next prime is 21266411666141. The reversal of 21266411666116 is 61166611466212.

It can be written as a sum of positive squares in 2 ways, for example, as 13551572112516 + 7714839553600 = 3681246^2 + 2777560^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21266411666116.

It is not an unprimeable number, because it can be changed into a prime (21266411666113) 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, 71845985211 + ... + 71845985506.

Almost surely, 2^{21266411666116} is an apocalyptic number.

It is an amenable number.

21266411666116 is a deficient number, since it is larger than the sum of its proper divisors (16955652544872).

21266411666116 is a wasteful number, since it uses less digits than its factorization.

21266411666116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143691970758 (or 143691970756 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The spelling of 21266411666116 in words is "twenty-one trillion, two hundred sixty-six billion, four hundred eleven million, six hundred sixty-six thousand, one hundred sixteen".