2167021 has 2 divisors, whose sum is σ = 2167022. Its totient is φ = 2167020.

The previous prime is 2167019. The next prime is 2167031. The reversal of 2167021 is 1207612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144900 + 1022121 = 1070^2 + 1011^2 .

It is a cyclic number.

It is not a de Polignac number, because 2167021 - 2¹ = 2167019 is a prime.

Together with 2167019, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2167021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2167031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083510 + 1083511.

It is an arithmetic number, because the mean of its divisors is an integer number (1083511).

2^2167021 is an apocalyptic number.

It is an amenable number.

2167021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2167021 is an equidigital number, since it uses as much as digits as its factorization.

2167021 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 2167021 is about 1472.0805005162. The cubic root of 2167021 is about 129.4059881273.

The spelling of 2167021 in words is "two million, one hundred sixty-seven thousand, twenty-one".