172134642221 has 8 divisors (see below), whose sum is σ = 172366431360. Its totient is φ = 171902935728.

The previous prime is 172134642149. The next prime is 172134642227. The reversal of 172134642221 is 122246431271.

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 172134642221 - 2¹⁰ = 172134641197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172134642227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4928000 + ... + 4962806.

It is an arithmetic number, because the mean of its divisors is an integer number (21545803920).

Almost surely, 2^172134642221 is an apocalyptic number.

It is an amenable number.

172134642221 is a deficient number, since it is larger than the sum of its proper divisors (231789139).

172134642221 is an equidigital number, since it uses as much as digits as its factorization.

172134642221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41323.

The product of its digits is 32256, while the sum is 35.

The spelling of 172134642221 in words is "one hundred seventy-two billion, one hundred thirty-four million, six hundred forty-two thousand, two hundred twenty-one".