2099021 has 2 divisors, whose sum is σ = 2099022. Its totient is φ = 2099020.

The previous prime is 2099017. The next prime is 2099033. The reversal of 2099021 is 1209902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 343396 = 1325^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099021 - 2² = 2099017 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 (2099081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1049510 + 1049511.

It is an arithmetic number, because the mean of its divisors is an integer number (1049511).

2^2099021 is an apocalyptic number.

It is an amenable number.

2099021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099021 is an equidigital number, since it uses as much as digits as its factorization.

2099021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 2099021 is about 1448.7998481502. The cubic root of 2099021 is about 128.0380136119.

The spelling of 2099021 in words is "two million, ninety-nine thousand, twenty-one".