21243324559 has 8 divisors (see below), whose sum is σ = 23100849648. Its totient is φ = 19453345920.

The previous prime is 21243324551. The next prime is 21243324581. The reversal of 21243324559 is 95542334212.

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 21243324559 - 2³ = 21243324551 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 (21243324551) 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, 16885957 + ... + 16887214.

It is an arithmetic number, because the mean of its divisors is an integer number (2887606206).

Almost surely, 2^21243324559 is an apocalyptic number.

21243324559 is a deficient number, since it is larger than the sum of its proper divisors (1857525089).

21243324559 is a wasteful number, since it uses less digits than its factorization.

21243324559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33773225.

The product of its digits is 259200, while the sum is 40.

The spelling of 21243324559 in words is "twenty-one billion, two hundred forty-three million, three hundred twenty-four thousand, five hundred fifty-nine".