804101821 has 8 divisors (see below), whose sum is σ = 832204800. Its totient is φ = 776023920.

The previous prime is 804101807. The next prime is 804101833. The reversal of 804101821 is 128101408.

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 804101821 - 2¹³ = 804093629 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 (804101801) 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, 78676 + ... + 88306.

It is an arithmetic number, because the mean of its divisors is an integer number (104025600).

Almost surely, 2^804101821 is an apocalyptic number.

It is an amenable number.

804101821 is a deficient number, since it is larger than the sum of its proper divisors (28102979).

804101821 is a wasteful number, since it uses less digits than its factorization.

804101821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12539.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 804101821 is about 28356.6891755720. The cubic root of 804101821 is about 929.9016433539.

The spelling of 804101821 in words is "eight hundred four million, one hundred one thousand, eight hundred twenty-one".