8204634323821 has 4 divisors (see below), whose sum is σ = 8835760041052. Its totient is φ = 7573508606592.

The previous prime is 8204634323801. The next prime is 8204634323867. The reversal of 8204634323821 is 1283234364028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1222541530596 + 6982092793225 = 1105686^2 + 2642365^2 .

It is a cyclic number.

It is not a de Polignac number, because 8204634323821 - 2²⁵ = 8204600769389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8204634323801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315562858596 + ... + 315562858621.

It is an arithmetic number, because the mean of its divisors is an integer number (2208940010263).

Almost surely, 2^{8204634323821} is an apocalyptic number.

It is an amenable number.

8204634323821 is a deficient number, since it is larger than the sum of its proper divisors (631125717231).

8204634323821 is a wasteful number, since it uses less digits than its factorization.

8204634323821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631125717230.

The product of its (nonzero) digits is 1327104, while the sum is 46.

Adding to 8204634323821 its reverse (1283234364028), we get a palindrome (9487868687849).

The spelling of 8204634323821 in words is "eight trillion, two hundred four billion, six hundred thirty-four million, three hundred twenty-three thousand, eight hundred twenty-one".