8113821 has 4 divisors (see below), whose sum is σ = 10818432. Its totient is φ = 5409212.

The previous prime is 8113789. The next prime is 8113829. The reversal of 8113821 is 1283118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8113821 - 2⁵ = 8113789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8113791 and 8113800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8113829) 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, 1352301 + ... + 1352306.

It is an arithmetic number, because the mean of its divisors is an integer number (2704608).

Almost surely, 2^8113821 is an apocalyptic number.

It is an amenable number.

8113821 is a deficient number, since it is larger than the sum of its proper divisors (2704611).

8113821 is a wasteful number, since it uses less digits than its factorization.

8113821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704610.

The product of its digits is 384, while the sum is 24.

The square root of 8113821 is about 2848.4769614655. The cubic root of 8113821 is about 200.9440452152.

Adding to 8113821 its reverse (1283118), we get a palindrome (9396939).

The spelling of 8113821 in words is "eight million, one hundred thirteen thousand, eight hundred twenty-one".