21333303312 has 40 divisors (see below), whose sum is σ = 55170471840. Its totient is φ = 7103431680.

The previous prime is 21333303283. The next prime is 21333303317. The reversal of 21333303312 is 21330333312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21333303317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194614 + ... + 283797.

It is an arithmetic number, because the mean of its divisors is an integer number (1379261796).

Almost surely, 2^21333303312 is an apocalyptic number.

It is an amenable number.

21333303312 is an abundant number, since it is smaller than the sum of its proper divisors (33837168528).

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

21333303312 is a wasteful number, since it uses less digits than its factorization.

21333303312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479351 (or 479345 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 24.

Adding to 21333303312 its reverse (21330333312), we get a palindrome (42663636624).

It can be divided in two parts, 21 and 333303312, that added together give a palindrome (333303333).

The spelling of 21333303312 in words is "twenty-one billion, three hundred thirty-three million, three hundred three thousand, three hundred twelve".