21330033312 has 144 divisors (see below), whose sum is σ = 65385109440. Its totient is φ = 5964214272.

The previous prime is 21330033287. The next prime is 21330033337. The reversal of 21330033312 is 21333003312.

It is an interprime number because it is at equal distance from previous prime (21330033287) and next prime (21330033337).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1477264 + ... + 1491632.

It is an arithmetic number, because the mean of its divisors is an integer number (454063260).

Almost surely, 2^21330033312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21330033312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32692554720).

21330033312 is an abundant number, since it is smaller than the sum of its proper divisors (44055076128).

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

21330033312 is a wasteful number, since it uses less digits than its factorization.

21330033312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14483 (or 14428 counting only the distinct ones).

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

Adding to 21330033312 its reverse (21333003312), we get a palindrome (42663036624).

The spelling of 21330033312 in words is "twenty-one billion, three hundred thirty million, thirty-three thousand, three hundred twelve".