21323031330 has 32 divisors (see below), whose sum is σ = 51327154944. Its totient is φ = 5669266176.

The previous prime is 21323031329. The next prime is 21323031341. The reversal of 21323031330 is 3313032312.

It is a junction number, because it is equal to n+sod(n) for n = 21323031297 and 21323031306.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1044442 + ... + 1064661.

It is an arithmetic number, because the mean of its divisors is an integer number (1603973592).

Almost surely, 2^21323031330 is an apocalyptic number.

21323031330 is an abundant number, since it is smaller than the sum of its proper divisors (30004123614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323031330 is a wasteful number, since it uses less digits than its factorization.

21323031330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109450.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21323031330 its reverse (3313032312), we get a palindrome (24636063642).

The spelling of 21323031330 in words is "twenty-one billion, three hundred twenty-three million, thirty-one thousand, three hundred thirty".