2101823 has 2 divisors, whose sum is σ = 2101824. Its totient is φ = 2101822.

The previous prime is 2101817. The next prime is 2101843. The reversal of 2101823 is 3281012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101823 - 2⁴ = 2101807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050911 + 1050912.

It is an arithmetic number, because the mean of its divisors is an integer number (1050912).

2^2101823 is an apocalyptic number.

2101823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101823 is an equidigital number, since it uses as much as digits as its factorization.

2101823 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2101823 is about 1449.7665329287. The cubic root of 2101823 is about 128.0949612705.

Adding to 2101823 its reverse (3281012), we get a palindrome (5382835).

The spelling of 2101823 in words is "two million, one hundred one thousand, eight hundred twenty-three".