21668770376607 has 16 divisors (see below), whose sum is σ = 29672746068320. Its totient is φ = 14055325949952.

The previous prime is 21668770376581. The next prime is 21668770376623. The reversal of 21668770376607 is 70667307786612.

It is not a de Polignac number, because 21668770376607 - 2⁷ = 21668770376479 is a prime.

It is a super-2 number, since 2×21668770376607² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21668770376647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18939519 + ... + 20051007.

It is an arithmetic number, because the mean of its divisors is an integer number (1854546629270).

Almost surely, 2^{21668770376607} is an apocalyptic number.

21668770376607 is a deficient number, since it is larger than the sum of its proper divisors (8003975691713).

21668770376607 is a wasteful number, since it uses less digits than its factorization.

21668770376607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287162.

The product of its (nonzero) digits is 149361408, while the sum is 66.

The spelling of 21668770376607 in words is "twenty-one trillion, six hundred sixty-eight billion, seven hundred seventy million, three hundred seventy-six thousand, six hundred seven".