421443803 has 4 divisors (see below), whose sum is σ = 459756888. Its totient is φ = 383130720.

The previous prime is 421443779. The next prime is 421443823. The reversal of 421443803 is 308344124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421443803 - 2¹⁰ = 421442779 is a prime.

It is a super-2 number, since 2×421443803² = 355229758174205618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421443823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19156526 + ... + 19156547.

It is an arithmetic number, because the mean of its divisors is an integer number (114939222).

Almost surely, 2^421443803 is an apocalyptic number.

421443803 is a deficient number, since it is larger than the sum of its proper divisors (38313085).

421443803 is a wasteful number, since it uses less digits than its factorization.

421443803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38313084.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 421443803 is about 20529.0964974107. The cubic root of 421443803 is about 749.7443887456.

Adding to 421443803 its reverse (308344124), we get a palindrome (729787927).

The spelling of 421443803 in words is "four hundred twenty-one million, four hundred forty-three thousand, eight hundred three".