21448793 has 2 divisors, whose sum is σ = 21448794. Its totient is φ = 21448792.

The previous prime is 21448723. The next prime is 21448799. The reversal of 21448793 is 39784412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20866624 + 582169 = 4568^2 + 763^2 .

It is a cyclic number.

It is not a de Polignac number, because 21448793 - 2¹² = 21444697 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 (21448799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724396 + 10724397.

It is an arithmetic number, because the mean of its divisors is an integer number (10724397).

Almost surely, 2^21448793 is an apocalyptic number.

It is an amenable number.

21448793 is a deficient number, since it is larger than the sum of its proper divisors (1).

21448793 is an equidigital number, since it uses as much as digits as its factorization.

21448793 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 21448793 is about 4631.2841631668. The cubic root of 21448793 is about 277.8439551779.

The spelling of 21448793 in words is "twenty-one million, four hundred forty-eight thousand, seven hundred ninety-three".