21230320324 has 18 divisors (see below), whose sum is σ = 39467094170. Its totient is φ = 9990738432.

The previous prime is 21230320313. The next prime is 21230320327. The reversal of 21230320324 is 42302303212.

It can be written as a sum of positive squares in 3 ways, for example, as 4897480324 + 16332840000 = 69982^2 + 127800^2 .

It is a super-3 number, since 3×21230320324³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21230320295 and 21230320304.

It is not an unprimeable number, because it can be changed into a prime (21230320327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9181509 + ... + 9183820.

Almost surely, 2^21230320324 is an apocalyptic number.

It is an amenable number.

21230320324 is a deficient number, since it is larger than the sum of its proper divisors (18236773846).

21230320324 is a wasteful number, since it uses less digits than its factorization.

21230320324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18365367 (or 18365348 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21230320324 its reverse (42302303212), we get a palindrome (63532623536).

The spelling of 21230320324 in words is "twenty-one billion, two hundred thirty million, three hundred twenty thousand, three hundred twenty-four".