21324565321 has 8 divisors (see below), whose sum is σ = 21678723360. Its totient is φ = 20973275328.

The previous prime is 21324565307. The next prime is 21324565333. The reversal of 21324565321 is 12356542312.

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 21324565321 - 2²⁷ = 21190347593 is a prime.

It is a super-2 number, since 2×21324565321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324565351) 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, 702016 + ... + 731761.

It is an arithmetic number, because the mean of its divisors is an integer number (2709840420).

Almost surely, 2^21324565321 is an apocalyptic number.

It is an amenable number.

21324565321 is a deficient number, since it is larger than the sum of its proper divisors (354158039).

21324565321 is a wasteful number, since it uses less digits than its factorization.

21324565321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434023.

The product of its digits is 43200, while the sum is 34.

The spelling of 21324565321 in words is "twenty-one billion, three hundred twenty-four million, five hundred sixty-five thousand, three hundred twenty-one".