173125021 has 2 divisors, whose sum is σ = 173125022. Its totient is φ = 173125020.

The previous prime is 173125019. The next prime is 173125033. The reversal of 173125021 is 120521371.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152522500 + 20602521 = 12350^2 + 4539^2 .

It is a cyclic number.

It is not a de Polignac number, because 173125021 - 2¹ = 173125019 is a prime.

Together with 173125019, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 173124983 and 173125001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173125061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86562510 + 86562511.

It is an arithmetic number, because the mean of its divisors is an integer number (86562511).

Almost surely, 2^173125021 is an apocalyptic number.

It is an amenable number.

173125021 is a deficient number, since it is larger than the sum of its proper divisors (1).

173125021 is an equidigital number, since it uses as much as digits as its factorization.

173125021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 173125021 is about 13157.6981649527. The cubic root of 173125021 is about 557.3396574818.

Adding to 173125021 its reverse (120521371), we get a palindrome (293646392).

The spelling of 173125021 in words is "one hundred seventy-three million, one hundred twenty-five thousand, twenty-one".