6810021 has 8 divisors (see below), whose sum is σ = 10088960. Its totient is φ = 4539996.

The previous prime is 6810019. The next prime is 6810029. The reversal of 6810021 is 1200186.

6810021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6810021 - 2¹ = 6810019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6809976 and 6810003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6810029) 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, 126085 + ... + 126138.

It is an arithmetic number, because the mean of its divisors is an integer number (1261120).

Almost surely, 2^6810021 is an apocalyptic number.

It is an amenable number.

6810021 is a deficient number, since it is larger than the sum of its proper divisors (3278939).

6810021 is a wasteful number, since it uses less digits than its factorization.

6810021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252232 (or 252226 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 6810021 is about 2609.6016937456. The cubic root of 6810021 is about 189.5466662198.

It can be divided in two parts, 68100 and 21, that added together give a square (68121 = 261²).

The spelling of 6810021 in words is "six million, eight hundred ten thousand, twenty-one".