421040203 has 2 divisors, whose sum is σ = 421040204. Its totient is φ = 421040202.

The previous prime is 421040149. The next prime is 421040227. The reversal of 421040203 is 302040124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421040203 is a prime.

It is not a weakly prime, because it can be changed into another prime (421040293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210520101 + 210520102.

It is an arithmetic number, because the mean of its divisors is an integer number (210520102).

Almost surely, 2^421040203 is an apocalyptic number.

421040203 is a deficient number, since it is larger than the sum of its proper divisors (1).

421040203 is an equidigital number, since it uses as much as digits as its factorization.

421040203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 421040203 is about 20519.2641924607. The cubic root of 421040203 is about 749.5049788254.

Adding to 421040203 its reverse (302040124), we get a palindrome (723080327).

The spelling of 421040203 in words is "four hundred twenty-one million, forty thousand, two hundred three".