172433142421 has 4 divisors (see below), whose sum is σ = 172921621932. Its totient is φ = 171944662912.

The previous prime is 172433142389. The next prime is 172433142443. The reversal of 172433142421 is 124241334271.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53208648900 + 119224493521 = 230670^2 + 345289^2 .

It is a cyclic number.

It is not a de Polignac number, because 172433142421 - 2⁵ = 172433142389 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 (172433142461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244239226 + ... + 244239931.

It is an arithmetic number, because the mean of its divisors is an integer number (43230405483).

Almost surely, 2^172433142421 is an apocalyptic number.

It is an amenable number.

172433142421 is a deficient number, since it is larger than the sum of its proper divisors (488479511).

172433142421 is an equidigital number, since it uses as much as digits as its factorization.

172433142421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488479510.

The product of its digits is 32256, while the sum is 34.

Adding to 172433142421 its reverse (124241334271), we get a palindrome (296674476692).

The spelling of 172433142421 in words is "one hundred seventy-two billion, four hundred thirty-three million, one hundred forty-two thousand, four hundred twenty-one".