21300444440243 has 2 divisors, whose sum is σ = 21300444440244. Its totient is φ = 21300444440242.

The previous prime is 21300444440227. The next prime is 21300444440269. The reversal of 21300444440243 is 34204444400312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21300444440243 - 2⁴ = 21300444440227 is a prime.

It is not a weakly prime, because it can be changed into another prime (21300444440543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650222220121 + 10650222220122.

It is an arithmetic number, because the mean of its divisors is an integer number (10650222220122).

Almost surely, 2^{21300444440243} is an apocalyptic number.

21300444440243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300444440243 is an equidigital number, since it uses as much as digits as its factorization.

21300444440243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 35.

Adding to 21300444440243 its reverse (34204444400312), we get a palindrome (55504888840555).

The spelling of 21300444440243 in words is "twenty-one trillion, three hundred billion, four hundred forty-four million, four hundred forty thousand, two hundred forty-three".