21446533564447 has 2 divisors, whose sum is σ = 21446533564448. Its totient is φ = 21446533564446.

The previous prime is 21446533564399. The next prime is 21446533564549. The reversal of 21446533564447 is 74446533564412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21446533564447 - 2¹⁹ = 21446533040159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21446533564391 and 21446533564400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21446533565447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10723266782223 + 10723266782224.

It is an arithmetic number, because the mean of its divisors is an integer number (10723266782224).

Almost surely, 2^{21446533564447} is an apocalyptic number.

21446533564447 is a deficient number, since it is larger than the sum of its proper divisors (1).

21446533564447 is an equidigital number, since it uses as much as digits as its factorization.

21446533564447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116121600, while the sum is 58.

The spelling of 21446533564447 in words is "twenty-one trillion, four hundred forty-six billion, five hundred thirty-three million, five hundred sixty-four thousand, four hundred forty-seven".