172342243221 has 16 divisors (see below), whose sum is σ = 243832230144. Its totient is φ = 107902738944.

The previous prime is 172342243193. The next prime is 172342243237. The reversal of 172342243221 is 122342243271.

It is not a de Polignac number, because 172342243221 - 2⁵ = 172342243189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172342243121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3625696 + ... + 3672921.

It is an arithmetic number, because the mean of its divisors is an integer number (15239514384).

Almost surely, 2^172342243221 is an apocalyptic number.

It is an amenable number.

172342243221 is a deficient number, since it is larger than the sum of its proper divisors (71489986923).

172342243221 is a wasteful number, since it uses less digits than its factorization.

172342243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7299100.

The product of its digits is 32256, while the sum is 33.

Adding to 172342243221 its reverse (122342243271), we get a palindrome (294684486492).

The spelling of 172342243221 in words is "one hundred seventy-two billion, three hundred forty-two million, two hundred forty-three thousand, two hundred twenty-one".