21717607707723 has 64 divisors (see below), whose sum is σ = 31361323392000. Its totient is φ = 13321535145984.

The previous prime is 21717607707721. The next prime is 21717607707743. The reversal of 21717607707723 is 32770770671712.

It is not a de Polignac number, because 21717607707723 - 2¹ = 21717607707721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (21717607707721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4925742343 + ... + 4925746751.

It is an arithmetic number, because the mean of its divisors is an integer number (490020678000).

Almost surely, 2^{21717607707723} is an apocalyptic number.

21717607707723 is a deficient number, since it is larger than the sum of its proper divisors (9643715684277).

21717607707723 is a wasteful number, since it uses less digits than its factorization.

21717607707723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8164.

The product of its (nonzero) digits is 8470728, while the sum is 57.

The spelling of 21717607707723 in words is "twenty-one trillion, seven hundred seventeen billion, six hundred seven million, seven hundred seven thousand, seven hundred twenty-three".