6800021 has 4 divisors (see below), whose sum is σ = 6805344. Its totient is φ = 6794700.

The previous prime is 6799999. The next prime is 6800033. The reversal of 6800021 is 1200086.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1200086 = 2 ⋅600043.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6800021 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 (6800071) 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, 536 + ... + 3726.

It is an arithmetic number, because the mean of its divisors is an integer number (1701336).

Almost surely, 2^6800021 is an apocalyptic number.

It is an amenable number.

6800021 is a deficient number, since it is larger than the sum of its proper divisors (5323).

6800021 is a wasteful number, since it uses less digits than its factorization.

6800021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 6800021 is about 2607.6849886441. The cubic root of 6800021 is about 189.4538424628.

The spelling of 6800021 in words is "six million, eight hundred thousand, twenty-one".