21706161160717 has 4 divisors (see below), whose sum is σ = 23679448538976. Its totient is φ = 19732873782460.

The previous prime is 21706161160709. The next prime is 21706161160771. The reversal of 21706161160717 is 71706116160712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21706161160717 - 2³ = 21706161160709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706161160517) 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, 986643689113 + ... + 986643689134.

It is an arithmetic number, because the mean of its divisors is an integer number (5919862134744).

Almost surely, 2^{21706161160717} is an apocalyptic number.

It is an amenable number.

21706161160717 is a deficient number, since it is larger than the sum of its proper divisors (1973287378259).

21706161160717 is a wasteful number, since it uses less digits than its factorization.

21706161160717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973287378258.

The product of its (nonzero) digits is 148176, while the sum is 46.

It can be divided in two parts, 2170616 and 1160717, that added together give a palindrome (3331333).

The spelling of 21706161160717 in words is "twenty-one trillion, seven hundred six billion, one hundred sixty-one million, one hundred sixty thousand, seven hundred seventeen".