21441449 has 2 divisors, whose sum is σ = 21441450. Its totient is φ = 21441448.

The previous prime is 21441421. The next prime is 21441467. The reversal of 21441449 is 94414412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20187049 + 1254400 = 4493^2 + 1120^2 .

It is a cyclic number.

It is not a de Polignac number, because 21441449 - 2⁸ = 21441193 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 (21440449) 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, 10720724 + 10720725.

It is an arithmetic number, because the mean of its divisors is an integer number (10720725).

Almost surely, 2^21441449 is an apocalyptic number.

It is an amenable number.

21441449 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441449 is an equidigital number, since it uses as much as digits as its factorization.

21441449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 29.

The square root of 21441449 is about 4630.4912266411. The cubic root of 21441449 is about 277.8122405893.

The spelling of 21441449 in words is "twenty-one million, four hundred forty-one thousand, four hundred forty-nine".