421403303 has 2 divisors, whose sum is σ = 421403304. Its totient is φ = 421403302.

The previous prime is 421403251. The next prime is 421403357. The reversal of 421403303 is 303304124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421403303 - 2¹⁸ = 421141159 is a prime.

It is a super-3 number, since 3×421403303³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421403903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210701651 + 210701652.

It is an arithmetic number, because the mean of its divisors is an integer number (210701652).

Almost surely, 2^421403303 is an apocalyptic number.

421403303 is a deficient number, since it is larger than the sum of its proper divisors (1).

421403303 is an equidigital number, since it uses as much as digits as its factorization.

421403303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 421403303 is about 20528.1100688787. The cubic root of 421403303 is about 749.7203716088.

Adding to 421403303 its reverse (303304124), we get a palindrome (724707427).

The spelling of 421403303 in words is "four hundred twenty-one million, four hundred three thousand, three hundred three".