6812021 has 2 divisors, whose sum is σ = 6812022. Its totient is φ = 6812020.

The previous prime is 6812009. The next prime is 6812077. The reversal of 6812021 is 1202186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6027025 + 784996 = 2455^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 6812021 - 2¹⁴ = 6795637 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6811984 and 6812002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6812821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3406010 + 3406011.

It is an arithmetic number, because the mean of its divisors is an integer number (3406011).

Almost surely, 2^6812021 is an apocalyptic number.

It is an amenable number.

6812021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6812021 is an equidigital number, since it uses as much as digits as its factorization.

6812021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 6812021 is about 2609.9848658565. The cubic root of 6812021 is about 189.5652200650.

The spelling of 6812021 in words is "six million, eight hundred twelve thousand, twenty-one".