172231221205 has 8 divisors (see below), whose sum is σ = 206828664192. Its totient is φ = 137684177808.

The previous prime is 172231221203. The next prime is 172231221221. The reversal of 172231221205 is 502122132271.

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 172231221205 - 2¹ = 172231221203 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 (172231221203) 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, 12592377 + ... + 12606046.

It is an arithmetic number, because the mean of its divisors is an integer number (25853583024).

Almost surely, 2^172231221205 is an apocalyptic number.

It is an amenable number.

172231221205 is a deficient number, since it is larger than the sum of its proper divisors (34597442987).

172231221205 is a wasteful number, since it uses less digits than its factorization.

172231221205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25199795.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 172231221205 its reverse (502122132271), we get a palindrome (674353353476).

The spelling of 172231221205 in words is "one hundred seventy-two billion, two hundred thirty-one million, two hundred twenty-one thousand, two hundred five".