2021671 has 2 divisors, whose sum is σ = 2021672. Its totient is φ = 2021670.

The previous prime is 2021659. The next prime is 2021693. The reversal of 2021671 is 1761202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021671 - 2⁵ = 2021639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010835 + 1010836.

It is an arithmetic number, because the mean of its divisors is an integer number (1010836).

2^2021671 is an apocalyptic number.

2021671 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021671 is an equidigital number, since it uses as much as digits as its factorization.

2021671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 2021671 is about 1421.8547745814. The cubic root of 2021671 is about 126.4455336873.

Adding to 2021671 its reverse (1761202), we get a palindrome (3782873).

The spelling of 2021671 in words is "two million, twenty-one thousand, six hundred seventy-one".