21331321330 has 64 divisors (see below), whose sum is σ = 42966443520. Its totient is φ = 7557452800.

The previous prime is 21331321327. The next prime is 21331321331. The reversal of 21331321330 is 3312313312.

21331321330 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

Together with 21635122190 it forms an amicable pair .

It is not an unprimeable number, because it can be changed into a prime (21331321331) 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 31 ways as a sum of consecutive naturals, for example, 3862311 + ... + 3867829.

It is an arithmetic number, because the mean of its divisors is an integer number (671350680).

Almost surely, 2^21331321330 is an apocalyptic number.

21331321330 is an abundant number, since it is smaller than the sum of its proper divisors (21635122190).

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

21331321330 is a wasteful number, since it uses less digits than its factorization.

21331321330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6435.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21331321330 its reverse (3312313312), we get a palindrome (24643634642).

The spelling of 21331321330 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-one thousand, three hundred thirty".