21408330593 has 8 divisors (see below), whose sum is σ = 23379846336. Its totient is φ = 19483203600.

The previous prime is 21408330577. The next prime is 21408330667. The reversal of 21408330593 is 39503380412.

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 21408330593 - 2⁴ = 21408330577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21408330533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11596223 + ... + 11598068.

It is an arithmetic number, because the mean of its divisors is an integer number (2922480792).

Almost surely, 2^21408330593 is an apocalyptic number.

It is an amenable number.

21408330593 is a deficient number, since it is larger than the sum of its proper divisors (1971515743).

21408330593 is a wasteful number, since it uses less digits than its factorization.

21408330593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23194375.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 21408330593 in words is "twenty-one billion, four hundred eight million, three hundred thirty thousand, five hundred ninety-three".