21743464993 has 2 divisors, whose sum is σ = 21743464994. Its totient is φ = 21743464992.

The previous prime is 21743464991. The next prime is 21743465057. The reversal of 21743464993 is 39946434712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20860602624 + 882862369 = 144432^2 + 29713^2 .

It is a cyclic number.

It is not a de Polignac number, because 21743464993 - 2¹ = 21743464991 is a prime.

Together with 21743464991, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21743464993.

It is not a weakly prime, because it can be changed into another prime (21743464991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10871732496 + 10871732497.

It is an arithmetic number, because the mean of its divisors is an integer number (10871732497).

Almost surely, 2^21743464993 is an apocalyptic number.

It is an amenable number.

21743464993 is a deficient number, since it is larger than the sum of its proper divisors (1).

21743464993 is an equidigital number, since it uses as much as digits as its factorization.

21743464993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 52.

The spelling of 21743464993 in words is "twenty-one billion, seven hundred forty-three million, four hundred sixty-four thousand, nine hundred ninety-three".