21154366966905 has 48 divisors (see below), whose sum is σ = 39062672513280. Its totient is φ = 10553517402624.

The previous prime is 21154366966879. The next prime is 21154366966921. The reversal of 21154366966905 is 50966966345112.

21154366966905 is a `hidden beast` number, since 21 + 1 + 5 + 436 + 6 + 96 + 6 + 90 + 5 = 666.

It is not a de Polignac number, because 21154366966905 - 2⁶ = 21154366966841 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 84699745 + ... + 84949134.

It is an arithmetic number, because the mean of its divisors is an integer number (813805677360).

Almost surely, 2^{21154366966905} is an apocalyptic number.

It is an amenable number.

21154366966905 is a deficient number, since it is larger than the sum of its proper divisors (17908305546375).

21154366966905 is a wasteful number, since it uses less digits than its factorization.

21154366966905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169649070 (or 169649067 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 63.

The spelling of 21154366966905 in words is "twenty-one trillion, one hundred fifty-four billion, three hundred sixty-six million, nine hundred sixty-six thousand, nine hundred five".