21283841 has 2 divisors, whose sum is σ = 21283842. Its totient is φ = 21283840.

The previous prime is 21283777. The next prime is 21283859. The reversal of 21283841 is 14838212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21196816 + 87025 = 4604^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 21283841 - 2⁶ = 21283777 is a prime.

It is not a weakly prime, because it can be changed into another prime (21283891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10641920 + 10641921.

It is an arithmetic number, because the mean of its divisors is an integer number (10641921).

Almost surely, 2^21283841 is an apocalyptic number.

It is an amenable number.

21283841 is a deficient number, since it is larger than the sum of its proper divisors (1).

21283841 is an equidigital number, since it uses as much as digits as its factorization.

21283841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 29.

The square root of 21283841 is about 4613.4413402578. The cubic root of 21283841 is about 277.1298682478.

The spelling of 21283841 in words is "twenty-one million, two hundred eighty-three thousand, eight hundred forty-one".