6801821 has 16 divisors (see below), whose sum is σ = 7660800. Its totient is φ = 5997888.

The previous prime is 6801797. The next prime is 6801833. The reversal of 6801821 is 1281086.

It is not a de Polignac number, because 6801821 - 2⁶ = 6801757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6801521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37910 + ... + 38088.

It is an arithmetic number, because the mean of its divisors is an integer number (478800).

Almost surely, 2^6801821 is an apocalyptic number.

It is an amenable number.

6801821 is a deficient number, since it is larger than the sum of its proper divisors (858979).

6801821 is a wasteful number, since it uses less digits than its factorization.

6801821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 6801821 is about 2608.0300995196. The cubic root of 6801821 is about 189.4705574519.

The spelling of 6801821 in words is "six million, eight hundred one thousand, eight hundred twenty-one".