21739001840717 has 8 divisors (see below), whose sum is σ = 24845209045056. Its totient is φ = 18632953514592.

The previous prime is 21739001840713. The next prime is 21739001840729. The reversal of 21739001840717 is 71704810093712.

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 21739001840717 - 2² = 21739001840713 is a prime.

It is a super-2 number, since 2×21739001840717² (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 (21739001840711) 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, 39426203 + ... + 39973784.

It is an arithmetic number, because the mean of its divisors is an integer number (3105651130632).

Almost surely, 2^{21739001840717} is an apocalyptic number.

It is an amenable number.

21739001840717 is a deficient number, since it is larger than the sum of its proper divisors (3106207204339).

21739001840717 is an equidigital number, since it uses as much as digits as its factorization.

21739001840717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79439107.

The product of its (nonzero) digits is 592704, while the sum is 50.

The spelling of 21739001840717 in words is "twenty-one trillion, seven hundred thirty-nine billion, one million, eight hundred forty thousand, seven hundred seventeen".