505140421 has 8 divisors (see below), whose sum is σ = 528675264. Its totient is φ = 481736640.

The previous prime is 505140347. The next prime is 505140463. The reversal of 505140421 is 124041505.

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 505140421 - 2²¹ = 503043269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505140392 and 505140401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505140481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24835 + ... + 40336.

It is an arithmetic number, because the mean of its divisors is an integer number (66084408).

Almost surely, 2^505140421 is an apocalyptic number.

It is an amenable number.

505140421 is a deficient number, since it is larger than the sum of its proper divisors (23534843).

505140421 is a wasteful number, since it uses less digits than its factorization.

505140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65531.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 505140421 is about 22475.3291633293. The cubic root of 505140421 is about 796.4112275681.

Adding to 505140421 its reverse (124041505), we get a palindrome (629181926).

The spelling of 505140421 in words is "five hundred five million, one hundred forty thousand, four hundred twenty-one".