171421784421 has 8 divisors (see below), whose sum is σ = 229370021280. Its totient is φ = 113877368592.

The previous prime is 171421784399. The next prime is 171421784447. The reversal of 171421784421 is 124487124171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 171421784421 - 2¹⁰ = 171421783397 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171421784321) 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, 100954266 + ... + 100955963.

It is an arithmetic number, because the mean of its divisors is an integer number (28671252660).

Almost surely, 2^171421784421 is an apocalyptic number.

It is an amenable number.

171421784421 is a deficient number, since it is larger than the sum of its proper divisors (57948236859).

171421784421 is a wasteful number, since it uses less digits than its factorization.

171421784421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201910515.

The product of its digits is 100352, while the sum is 42.

The spelling of 171421784421 in words is "one hundred seventy-one billion, four hundred twenty-one million, seven hundred eighty-four thousand, four hundred twenty-one".