171340401673821 has 16 divisors (see below), whose sum is σ = 229266514249920. Its totient is φ = 113820723813120.

The previous prime is 171340401673801. The next prime is 171340401673829. The reversal of 171340401673821 is 128376104043171.

It is not a de Polignac number, because 171340401673821 - 2¹⁵ = 171340401641053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171340401673829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7882611 + ... + 20120048.

It is an arithmetic number, because the mean of its divisors is an integer number (14329157140620).

Almost surely, 2^{171340401673821} is an apocalyptic number.

It is an amenable number.

171340401673821 is a deficient number, since it is larger than the sum of its proper divisors (57926112576099).

171340401673821 is a wasteful number, since it uses less digits than its factorization.

171340401673821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28009916.

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 171340401673821 in words is "one hundred seventy-one trillion, three hundred forty billion, four hundred one million, six hundred seventy-three thousand, eight hundred twenty-one".