421403173 has 2 divisors, whose sum is σ = 421403174. Its totient is φ = 421403172.

The previous prime is 421403167. The next prime is 421403219. The reversal of 421403173 is 371304124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331494849 + 89908324 = 18207^2 + 9482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421403173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421403153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210701586 + 210701587.

It is an arithmetic number, because the mean of its divisors is an integer number (210701587).

Almost surely, 2^421403173 is an apocalyptic number.

It is an amenable number.

421403173 is a deficient number, since it is larger than the sum of its proper divisors (1).

421403173 is an equidigital number, since it uses as much as digits as its factorization.

421403173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 421403173 is about 20528.1069024886. The cubic root of 421403173 is about 749.7202945142.

Adding to 421403173 its reverse (371304124), we get a palindrome (792707297).

The spelling of 421403173 in words is "four hundred twenty-one million, four hundred three thousand, one hundred seventy-three".