505603600421 has 4 divisors (see below), whose sum is σ = 505640881152. Its totient is φ = 505566319692.

The previous prime is 505603600417. The next prime is 505603600433. The reversal of 505603600421 is 124006306505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124006306505 = 5 ⋅24801261301.

It is a cyclic number.

It is not a de Polignac number, because 505603600421 - 2² = 505603600417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505603600321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18620015 + ... + 18647148.

It is an arithmetic number, because the mean of its divisors is an integer number (126410220288).

Almost surely, 2^505603600421 is an apocalyptic number.

It is an amenable number.

505603600421 is a deficient number, since it is larger than the sum of its proper divisors (37280731).

505603600421 is a wasteful number, since it uses less digits than its factorization.

505603600421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37280730.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 505603600421 its reverse (124006306505), we get a palindrome (629609906926).

The spelling of 505603600421 in words is "five hundred five billion, six hundred three million, six hundred thousand, four hundred twenty-one".