21743465561 has 8 divisors (see below), whose sum is σ = 21844848000. Its totient is φ = 21642253920.

The previous prime is 21743465531. The next prime is 21743465581. The reversal of 21743465561 is 16556434712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21743465561 - 2¹⁴ = 21743449177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21743465501) 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 in 7 ways as a sum of consecutive naturals, for example, 216140 + ... + 300338.

It is an arithmetic number, because the mean of its divisors is an integer number (2730606000).

Almost surely, 2^21743465561 is an apocalyptic number.

It is an amenable number.

21743465561 is a deficient number, since it is larger than the sum of its proper divisors (101382439).

21743465561 is an equidigital number, since it uses as much as digits as its factorization.

21743465561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85399.

The product of its digits is 604800, while the sum is 44.

The spelling of 21743465561 in words is "twenty-one billion, seven hundred forty-three million, four hundred sixty-five thousand, five hundred sixty-one".