421305315503 has 8 divisors (see below), whose sum is σ = 424980559872. Its totient is φ = 417635663256.

The previous prime is 421305315469. The next prime is 421305315539. The reversal of 421305315503 is 305513503124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421305315503 - 2²⁰ = 421304266927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421305315503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421305315583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246625 + ... + 1548122.

It is an arithmetic number, because the mean of its divisors is an integer number (53122569984).

Almost surely, 2^421305315503 is an apocalyptic number.

421305315503 is a deficient number, since it is larger than the sum of its proper divisors (3675244369).

421305315503 is a wasteful number, since it uses less digits than its factorization.

421305315503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796061.

The product of its (nonzero) digits is 27000, while the sum is 32.

Adding to 421305315503 its reverse (305513503124), we get a palindrome (726818818627).

The spelling of 421305315503 in words is "four hundred twenty-one billion, three hundred five million, three hundred fifteen thousand, five hundred three".