172427542321 has 2 divisors, whose sum is σ = 172427542322. Its totient is φ = 172427542320.

The previous prime is 172427542267. The next prime is 172427542349. The reversal of 172427542321 is 123245724271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141951111696 + 30476430625 = 376764^2 + 174575^2 .

It is an emirp because it is prime and its reverse (123245724271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172427542321 - 2²³ = 172419153713 is a prime.

It is not a weakly prime, because it can be changed into another prime (172427542621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86213771160 + 86213771161.

It is an arithmetic number, because the mean of its divisors is an integer number (86213771161).

Almost surely, 2^172427542321 is an apocalyptic number.

It is an amenable number.

172427542321 is a deficient number, since it is larger than the sum of its proper divisors (1).

172427542321 is an equidigital number, since it uses as much as digits as its factorization.

172427542321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 40.

The spelling of 172427542321 in words is "one hundred seventy-two billion, four hundred twenty-seven million, five hundred forty-two thousand, three hundred twenty-one".