503344420021 has 2 divisors, whose sum is σ = 503344420022. Its totient is φ = 503344420020.

The previous prime is 503344420013. The next prime is 503344420067. The reversal of 503344420021 is 120024443305.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404362451025 + 98981968996 = 635895^2 + 314614^2 .

It is a cyclic number.

It is not a de Polignac number, because 503344420021 - 2³ = 503344420013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (503344420081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251672210010 + 251672210011.

It is an arithmetic number, because the mean of its divisors is an integer number (251672210011).

Almost surely, 2^503344420021 is an apocalyptic number.

It is an amenable number.

503344420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

503344420021 is an equidigital number, since it uses as much as digits as its factorization.

503344420021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 503344420021 its reverse (120024443305), we get a palindrome (623368863326).

The spelling of 503344420021 in words is "five hundred three billion, three hundred forty-four million, four hundred twenty thousand, twenty-one".