21344557717 has 8 divisors (see below), whose sum is σ = 24399653696. Its totient is φ = 18290930112.

The previous prime is 21344557643. The next prime is 21344557733. The reversal of 21344557717 is 71775544312.

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

It is not a de Polignac number, because 21344557717 - 2¹⁹ = 21344033429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344057717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335763 + ... + 394240.

It is an arithmetic number, because the mean of its divisors is an integer number (3049956712).

Almost surely, 2^21344557717 is an apocalyptic number.

It is an amenable number.

21344557717 is a deficient number, since it is larger than the sum of its proper divisors (3055095979).

21344557717 is an equidigital number, since it uses as much as digits as its factorization.

21344557717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734187.

The product of its digits is 823200, while the sum is 46.

The spelling of 21344557717 in words is "twenty-one billion, three hundred forty-four million, five hundred fifty-seven thousand, seven hundred seventeen".