21323312330 has 32 divisors (see below), whose sum is σ = 40778522064. Its totient is φ = 8000183296.

The previous prime is 21323312303. The next prime is 21323312333. The reversal of 21323312330 is 3321332312.

It can be written as a sum of positive squares in 8 ways, for example, as 18735860641 + 2587451689 = 136879^2 + 50867^2 .

It is a super-3 number, since 3×21323312330³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21323312296 and 21323312305.

It is not an unprimeable number, because it can be changed into a prime (21323312333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164237 + ... + 263856.

Almost surely, 2^21323312330 is an apocalyptic number.

21323312330 is a deficient number, since it is larger than the sum of its proper divisors (19455209734).

21323312330 is a wasteful number, since it uses less digits than its factorization.

21323312330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428410.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21323312330 its reverse (3321332312), we get a palindrome (24644644642).

The spelling of 21323312330 in words is "twenty-one billion, three hundred twenty-three million, three hundred twelve thousand, three hundred thirty".