172231221204 has 144 divisors (see below), whose sum is σ = 524299776000. Its totient is φ = 46569515328.

The previous prime is 172231221203. The next prime is 172231221221. The reversal of 172231221204 is 402122132271.

It is a happy number.

172231221204 is a `hidden beast` number, since 1 + 7 + 2 + 231 + 221 + 204 = 666.

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 47 ways as a sum of consecutive naturals, for example, 4611397 + ... + 4648595.

Almost surely, 2^172231221204 is an apocalyptic number.

172231221204 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172231221204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262149888000).

172231221204 is an abundant number, since it is smaller than the sum of its proper divisors (352068554796).

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

172231221204 is a wasteful number, since it uses less digits than its factorization.

172231221204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38202 (or 38197 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

Adding to 172231221204 its reverse (402122132271), we get a palindrome (574353353475).

The spelling of 172231221204 in words is "one hundred seventy-two billion, two hundred thirty-one million, two hundred twenty-one thousand, two hundred four".