510421 has 4 divisors (see below), whose sum is σ = 515052. Its totient is φ = 505792.

The previous prime is 510403. The next prime is 510449. The reversal of 510421 is 124015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4900 + 505521 = 70^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 510421 - 2⁹ = 509909 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 (510401) 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, 2146 + ... + 2371.

It is an arithmetic number, because the mean of its divisors is an integer number (128763).

2⁵¹⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

510421 is a deficient number, since it is larger than the sum of its proper divisors (4631).

510421 is a wasteful number, since it uses less digits than its factorization.

510421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 510421 is about 714.4375410069. The cubic root of 510421 is about 79.9176757297.

Adding to 510421 its reverse (124015), we get a palindrome (634436).

The spelling of 510421 in words is "five hundred ten thousand, four hundred twenty-one".