173200421 has 2 divisors, whose sum is σ = 173200422. Its totient is φ = 173200420.

The previous prime is 173200351. The next prime is 173200451. The reversal of 173200421 is 124002371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171348100 + 1852321 = 13090^2 + 1361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-173200421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 173200393 and 173200402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173200451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86600210 + 86600211.

It is an arithmetic number, because the mean of its divisors is an integer number (86600211).

Almost surely, 2^173200421 is an apocalyptic number.

It is an amenable number.

173200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

173200421 is an equidigital number, since it uses as much as digits as its factorization.

173200421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 173200421 is about 13160.5630958557. The cubic root of 173200421 is about 557.4205572283.

Adding to 173200421 its reverse (124002371), we get a palindrome (297202792).

The spelling of 173200421 in words is "one hundred seventy-three million, two hundred thousand, four hundred twenty-one".