804021210 has 24 divisors (see below), whose sum is σ = 2090455380. Its totient is φ = 214405632.

The previous prime is 804021203. The next prime is 804021217. The reversal of 804021210 is 12120408.

It is an interprime number because it is at equal distance from previous prime (804021203) and next prime (804021217).

It can be written as a sum of positive squares in 2 ways, for example, as 763914321 + 40106889 = 27639^2 + 6333^2 .

It is a super-2 number, since 2×804021210² = 1292900212259728200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (804021217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4466695 + ... + 4466874.

Almost surely, 2^804021210 is an apocalyptic number.

804021210 is an abundant number, since it is smaller than the sum of its proper divisors (1286434170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

804021210 is a wasteful number, since it uses less digits than its factorization.

804021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8933582 (or 8933579 counting only the distinct ones).

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

The square root of 804021210 is about 28355.2677645618. The cubic root of 804021210 is about 929.8705681822.

Adding to 804021210 its reverse (12120408), we get a palindrome (816141618).

The spelling of 804021210 in words is "eight hundred four million, twenty-one thousand, two hundred ten".