21116000700666 has 24 divisors (see below), whose sum is σ = 45751511725140. Its totient is φ = 7038639688896.

The previous prime is 21116000700631. The next prime is 21116000700679. The reversal of 21116000700666 is 66600700061112.

It can be written as a sum of positive squares in 2 ways, for example, as 20093837238225 + 1022163462441 = 4482615^2 + 1011021^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21116000700666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2827086 + ... + 7086918.

Almost surely, 2^{21116000700666} is an apocalyptic number.

21116000700666 is an abundant number, since it is smaller than the sum of its proper divisors (24635511024474).

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

21116000700666 is a wasteful number, since it uses less digits than its factorization.

21116000700666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4535230 (or 4535227 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

Adding to 21116000700666 its reverse (66600700061112), we get a palindrome (87716700761778).

The spelling of 21116000700666 in words is "twenty-one trillion, one hundred sixteen billion, seven hundred thousand, six hundred sixty-six".