21836717036705 has 16 divisors (see below), whose sum is σ = 28702216311120. Its totient is φ = 15874806054912.

The previous prime is 21836717036683. The next prime is 21836717036833. The reversal of 21836717036705 is 50763071763812.

It can be written as a sum of positive squares in 8 ways, for example, as 2904785061649 + 18931931975056 = 1704343^2 + 4351084^2 .

It is a cyclic number.

It is not a de Polignac number, because 21836717036705 - 2¹⁶ = 21836716971169 is a prime.

It is a super-2 number, since 2×21836717036705² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4429351904 + ... + 4429356833.

It is an arithmetic number, because the mean of its divisors is an integer number (1793888519445).

Almost surely, 2^{21836717036705} is an apocalyptic number.

It is an amenable number.

21836717036705 is a deficient number, since it is larger than the sum of its proper divisors (6865499274415).

21836717036705 is a wasteful number, since it uses less digits than its factorization.

21836717036705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8858708788.

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 21836717036705 in words is "twenty-one trillion, eight hundred thirty-six billion, seven hundred seventeen million, thirty-six thousand, seven hundred five".