810206421 has 8 divisors (see below), whose sum is σ = 1115122944. Its totient is φ = 522713760.

The previous prime is 810206407. The next prime is 810206443. The reversal of 810206421 is 124602018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 810206421 - 2¹⁴ = 810190037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 810206391 and 810206400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810206401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4355856 + ... + 4356041.

It is an arithmetic number, because the mean of its divisors is an integer number (139390368).

Almost surely, 2^810206421 is an apocalyptic number.

It is an amenable number.

810206421 is a deficient number, since it is larger than the sum of its proper divisors (304916523).

810206421 is a wasteful number, since it uses less digits than its factorization.

810206421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8711931.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 810206421 is about 28464.1251578193. The cubic root of 810206421 is about 932.2489300039.

Adding to 810206421 its reverse (124602018), we get a palindrome (934808439).

The spelling of 810206421 in words is "eight hundred ten million, two hundred six thousand, four hundred twenty-one".