503021421 has 48 divisors (see below), whose sum is σ = 869092224. Its totient is φ = 284788224.

The previous prime is 503021419. The next prime is 503021479. The reversal of 503021421 is 124120305.

It is not a de Polignac number, because 503021421 - 2¹ = 503021419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 503021394 and 503021403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503021411) 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 in 47 ways as a sum of consecutive naturals, for example, 190905 + ... + 193521.

It is an arithmetic number, because the mean of its divisors is an integer number (18106088).

Almost surely, 2^503021421 is an apocalyptic number.

It is an amenable number.

503021421 is a deficient number, since it is larger than the sum of its proper divisors (366070803).

503021421 is a wasteful number, since it uses less digits than its factorization.

503021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752 (or 2740 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 503021421 is about 22428.1390445128. The cubic root of 503021421 is about 795.2960520741.

Adding to 503021421 its reverse (124120305), we get a palindrome (627141726).

The spelling of 503021421 in words is "five hundred three million, twenty-one thousand, four hundred twenty-one".