21001320330 has 32 divisors (see below), whose sum is σ = 50532768000. Its totient is φ = 5585952192.

The previous prime is 21001320323. The next prime is 21001320343. The reversal of 21001320330 is 3302310012.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 888130 + ... + 911469.

It is an arithmetic number, because the mean of its divisors is an integer number (1579149000).

Almost surely, 2^21001320330 is an apocalyptic number.

21001320330 is an abundant number, since it is smaller than the sum of its proper divisors (29531447670).

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

21001320330 is a wasteful number, since it uses less digits than its factorization.

21001320330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799998.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21001320330 its reverse (3302310012), we get a palindrome (24303630342).

The spelling of 21001320330 in words is "twenty-one billion, one million, three hundred twenty thousand, three hundred thirty".