810421 has 8 divisors (see below), whose sum is σ = 849024. Its totient is φ = 772800.

The previous prime is 810419. The next prime is 810427. The reversal of 810421 is 124018.

It is a happy number.

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 810421 - 2¹ = 810419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 810395 and 810404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810427) 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, 1821 + ... + 2221.

It is an arithmetic number, because the mean of its divisors is an integer number (106128).

2⁸¹⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

810421 is a deficient number, since it is larger than the sum of its proper divisors (38603).

810421 is a wasteful number, since it uses less digits than its factorization.

810421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 810421 is about 900.2338585057. The cubic root of 810421 is about 93.2331223183.

Adding to 810421 its reverse (124018), we get a palindrome (934439).

The spelling of 810421 in words is "eight hundred ten thousand, four hundred twenty-one".