21233403312 has 120 divisors (see below), whose sum is σ = 60828367152. Its totient is φ = 6377226240.

The previous prime is 21233403307. The next prime is 21233403413. The reversal of 21233403312 is 21330433212.

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

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, 640128 + ... + 672480.

Almost surely, 2^21233403312 is an apocalyptic number.

21233403312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21233403312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30414183576).

21233403312 is an abundant number, since it is smaller than the sum of its proper divisors (39594963840).

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

21233403312 is a wasteful number, since it uses less digits than its factorization.

21233403312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32499 (or 32482 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21233403312 its reverse (21330433212), we get a palindrome (42563836524).

The spelling of 21233403312 in words is "twenty-one billion, two hundred thirty-three million, four hundred three thousand, three hundred twelve".