421321503 has 4 divisors (see below), whose sum is σ = 561762008. Its totient is φ = 280881000.

The previous prime is 421321463. The next prime is 421321513. The reversal of 421321503 is 305123124.

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

It is not a de Polignac number, because 421321503 - 2²² = 417127199 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 421321503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421321513) 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, 70220248 + ... + 70220253.

It is an arithmetic number, because the mean of its divisors is an integer number (140440502).

Almost surely, 2^421321503 is an apocalyptic number.

421321503 is a deficient number, since it is larger than the sum of its proper divisors (140440505).

421321503 is a wasteful number, since it uses less digits than its factorization.

421321503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140440504.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 421321503 is about 20526.1175822414. The cubic root of 421321503 is about 749.6718582294.

Adding to 421321503 its reverse (305123124), we get a palindrome (726444627).

The spelling of 421321503 in words is "four hundred twenty-one million, three hundred twenty-one thousand, five hundred three".