170200421 has 2 divisors, whose sum is σ = 170200422. Its totient is φ = 170200420.

The previous prime is 170200411. The next prime is 170200439. The reversal of 170200421 is 124002071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170015521 + 184900 = 13039^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 170200421 - 2²⁶ = 103091557 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 170200421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170200411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85100210 + 85100211.

It is an arithmetic number, because the mean of its divisors is an integer number (85100211).

Almost surely, 2^170200421 is an apocalyptic number.

It is an amenable number.

170200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

170200421 is an equidigital number, since it uses as much as digits as its factorization.

170200421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 170200421 is about 13046.0883409549. The cubic root of 170200421 is about 554.1834389733.

Adding to 170200421 its reverse (124002071), we get a palindrome (294202492).

The spelling of 170200421 in words is "one hundred seventy million, two hundred thousand, four hundred twenty-one".