21321324345 has 8 divisors (see below), whose sum is σ = 34114118976. Its totient is φ = 11371372976.

The previous prime is 21321324329. The next prime is 21321324403. The reversal of 21321324345 is 54342312312.

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 21321324345 - 2⁴ = 21321324329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710710797 + ... + 710710826.

It is an arithmetic number, because the mean of its divisors is an integer number (4264264872).

Almost surely, 2^21321324345 is an apocalyptic number.

It is an amenable number.

21321324345 is a deficient number, since it is larger than the sum of its proper divisors (12792794631).

21321324345 is a wasteful number, since it uses less digits than its factorization.

21321324345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421421631.

The product of its digits is 17280, while the sum is 30.

Adding to 21321324345 its reverse (54342312312), we get a palindrome (75663636657).

The spelling of 21321324345 in words is "twenty-one billion, three hundred twenty-one million, three hundred twenty-four thousand, three hundred forty-five".