421500803 has 2 divisors, whose sum is σ = 421500804. Its totient is φ = 421500802.

The previous prime is 421500797. The next prime is 421500851. The reversal of 421500803 is 308005124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421500803 - 2¹⁰ = 421499779 is a prime.

It is not a weakly prime, because it can be changed into another prime (421500853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210750401 + 210750402.

It is an arithmetic number, because the mean of its divisors is an integer number (210750402).

Almost surely, 2^421500803 is an apocalyptic number.

421500803 is a deficient number, since it is larger than the sum of its proper divisors (1).

421500803 is an equidigital number, since it uses as much as digits as its factorization.

421500803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 421500803 is about 20530.4847239416. The cubic root of 421500803 is about 749.7781880354.

Adding to 421500803 its reverse (308005124), we get a palindrome (729505927).

The spelling of 421500803 in words is "four hundred twenty-one million, five hundred thousand, eight hundred three".