812421 has 12 divisors (see below), whose sum is σ = 1235520. Its totient is φ = 513000.

The previous prime is 812401. The next prime is 812431. The reversal of 812421 is 124218.

It is a de Polignac number, because none of the positive numbers 2^k-812421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 812394 and 812403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2205 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (102960).

2⁸¹²⁴²¹ is an apocalyptic number.

It is an amenable number.

812421 is a deficient number, since it is larger than the sum of its proper divisors (423099).

812421 is a wasteful number, since it uses less digits than its factorization.

812421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776 (or 4773 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 812421 is about 901.3439964852. The cubic root of 812421 is about 93.3097545313.

Adding to 812421 its reverse (124218), we get a palindrome (936639).

The spelling of 812421 in words is "eight hundred twelve thousand, four hundred twenty-one".