171221543432 has 96 divisors (see below), whose sum is σ = 345021336000. Its totient is φ = 79637160960.

The previous prime is 171221543431. The next prime is 171221543443. The reversal of 171221543432 is 234345122171.

It is a happy number.

171221543432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 171221543392 and 171221543401.

It is not an unprimeable number, because it can be changed into a prime (171221543431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166072757 + ... + 166073787.

It is an arithmetic number, because the mean of its divisors is an integer number (3593972250).

Almost surely, 2^171221543432 is an apocalyptic number.

It is an amenable number.

171221543432 is an abundant number, since it is smaller than the sum of its proper divisors (173799792568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171221543432 is a wasteful number, since it uses less digits than its factorization.

171221543432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839 (or 1818 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The spelling of 171221543432 in words is "one hundred seventy-one billion, two hundred twenty-one million, five hundred forty-three thousand, four hundred thirty-two".