809130021 has 8 divisors (see below), whose sum is σ = 1232960064. Its totient is φ = 462360000.

The previous prime is 809130001. The next prime is 809130031. The reversal of 809130021 is 120031908.

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

It is not a de Polignac number, because 809130021 - 2⁹ = 809129509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 809129973 and 809130000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809130001) 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, 19264980 + ... + 19265021.

It is an arithmetic number, because the mean of its divisors is an integer number (154120008).

Almost surely, 2^809130021 is an apocalyptic number.

It is an amenable number.

809130021 is a deficient number, since it is larger than the sum of its proper divisors (423830043).

809130021 is a wasteful number, since it uses less digits than its factorization.

809130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38530011.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 809130021 is about 28445.2108622875. The cubic root of 809130021 is about 931.8359005016.

Adding to 809130021 its reverse (120031908), we get a palindrome (929161929).

The spelling of 809130021 in words is "eight hundred nine million, one hundred thirty thousand, twenty-one".