8133821 has 8 divisors (see below), whose sum is σ = 8390400. Its totient is φ = 7879248.

The previous prime is 8133809. The next prime is 8133841. The reversal of 8133821 is 1283318.

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

It is a cyclic number.

It is not a de Polignac number, because 8133821 - 2⁶ = 8133757 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 (8133841) 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, 13280 + ... + 13878.

It is an arithmetic number, because the mean of its divisors is an integer number (1048800).

Almost surely, 2^8133821 is an apocalyptic number.

It is an amenable number.

8133821 is a deficient number, since it is larger than the sum of its proper divisors (256579).

8133821 is a wasteful number, since it uses less digits than its factorization.

8133821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003.

The product of its digits is 1152, while the sum is 26.

The square root of 8133821 is about 2851.9854487707. The cubic root of 8133821 is about 201.1090140724.

The spelling of 8133821 in words is "eight million, one hundred thirty-three thousand, eight hundred twenty-one".