21844793 has 2 divisors, whose sum is σ = 21844794. Its totient is φ = 21844792.

The previous prime is 21844789. The next prime is 21844807. The reversal of 21844793 is 39744812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21418384 + 426409 = 4628^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 21844793 - 2² = 21844789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21844703) 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, 10922396 + 10922397.

It is an arithmetic number, because the mean of its divisors is an integer number (10922397).

Almost surely, 2^21844793 is an apocalyptic number.

It is an amenable number.

21844793 is a deficient number, since it is larger than the sum of its proper divisors (1).

21844793 is an equidigital number, since it uses as much as digits as its factorization.

21844793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 21844793 is about 4673.8413537475. The cubic root of 21844793 is about 279.5434438888.

The spelling of 21844793 in words is "twenty-one million, eight hundred forty-four thousand, seven hundred ninety-three".