171452206821 has 72 divisors (see below), whose sum is σ = 284218197120. Its totient is φ = 91639102464.

The previous prime is 171452206817. The next prime is 171452206831. The reversal of 171452206821 is 128602254171.

It is not a de Polignac number, because 171452206821 - 2² = 171452206817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171452206821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171452206831) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4171845 + ... + 4212741.

It is an arithmetic number, because the mean of its divisors is an integer number (3947474960).

Almost surely, 2^171452206821 is an apocalyptic number.

It is an amenable number.

171452206821 is a deficient number, since it is larger than the sum of its proper divisors (112765990299).

171452206821 is a wasteful number, since it uses less digits than its factorization.

171452206821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41031 (or 41005 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 171452206821 in words is "one hundred seventy-one billion, four hundred fifty-two million, two hundred six thousand, eight hundred twenty-one".