21708956117 has 8 divisors (see below), whose sum is σ = 22509742080. Its totient is φ = 20914451280.

The previous prime is 21708956107. The next prime is 21708956119. The reversal of 21708956117 is 71165980712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21708956117 - 2³⁰ = 20635214293 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 (21708956119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1563242 + ... + 1577067.

It is an arithmetic number, because the mean of its divisors is an integer number (2813717760).

Almost surely, 2^21708956117 is an apocalyptic number.

It is an amenable number.

21708956117 is a deficient number, since it is larger than the sum of its proper divisors (800785963).

21708956117 is a wasteful number, since it uses less digits than its factorization.

21708956117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140563.

The product of its (nonzero) digits is 211680, while the sum is 47.

The spelling of 21708956117 in words is "twenty-one billion, seven hundred eight million, nine hundred fifty-six thousand, one hundred seventeen".