421443344503 has 2 divisors, whose sum is σ = 421443344504. Its totient is φ = 421443344502.

The previous prime is 421443344489. The next prime is 421443344513. The reversal of 421443344503 is 305443344124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421443344503 is a prime.

It is a super-3 number, since 3×421443344503³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421443344513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210721672251 + 210721672252.

It is an arithmetic number, because the mean of its divisors is an integer number (210721672252).

Almost surely, 2^421443344503 is an apocalyptic number.

421443344503 is a deficient number, since it is larger than the sum of its proper divisors (1).

421443344503 is an equidigital number, since it uses as much as digits as its factorization.

421443344503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 37.

Adding to 421443344503 its reverse (305443344124), we get a palindrome (726886688627).

The spelling of 421443344503 in words is "four hundred twenty-one billion, four hundred forty-three million, three hundred forty-four thousand, five hundred three".