21446533564399 has 2 divisors, whose sum is σ = 21446533564400. Its totient is φ = 21446533564398.

The previous prime is 21446533564369. The next prime is 21446533564447. The reversal of 21446533564399 is 99346533564412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21446533564399 - 2¹¹ = 21446533562351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21446533564399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21446533564369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10723266782199 + 10723266782200.

It is an arithmetic number, because the mean of its divisors is an integer number (10723266782200).

Almost surely, 2^{21446533564399} is an apocalyptic number.

21446533564399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21446533564399 is an equidigital number, since it uses as much as digits as its factorization.

21446533564399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 251942400, while the sum is 64.

The spelling of 21446533564399 in words is "twenty-one trillion, four hundred forty-six billion, five hundred thirty-three million, five hundred sixty-four thousand, three hundred ninety-nine".