21746320171 has 8 divisors (see below), whose sum is σ = 22359970944. Its totient is φ = 21134033280.

The previous prime is 21746320153. The next prime is 21746320207. The reversal of 21746320171 is 17102364712.

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 21746320171 - 2⁵ = 21746320139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21743320171) 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, 308590 + ... + 372451.

It is an arithmetic number, because the mean of its divisors is an integer number (2794996368).

Almost surely, 2^21746320171 is an apocalyptic number.

21746320171 is a deficient number, since it is larger than the sum of its proper divisors (613650773).

21746320171 is an equidigital number, since it uses as much as digits as its factorization.

21746320171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681941.

The product of its (nonzero) digits is 14112, while the sum is 34.

Adding to 21746320171 its reverse (17102364712), we get a palindrome (38848684883).

The spelling of 21746320171 in words is "twenty-one billion, seven hundred forty-six million, three hundred twenty thousand, one hundred seventy-one".