21333433308 has 192 divisors, whose sum is σ = 57701597184. Its totient is φ = 6074208000.

The previous prime is 21333433307. The next prime is 21333433313. The reversal of 21333433308 is 80333433312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333433307) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46276198 + ... + 46276658.

It is an arithmetic number, because the mean of its divisors is an integer number (300529152).

Almost surely, 2^21333433308 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 21333433308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28850798592).

21333433308 is an abundant number, since it is smaller than the sum of its proper divisors (36368163876).

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

21333433308 is a wasteful number, since it uses less digits than its factorization.

21333433308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 33.

It can be divided in two parts, 213334 and 33308, that added together give a palindrome (246642).

The spelling of 21333433308 in words is "twenty-one billion, three hundred thirty-three million, four hundred thirty-three thousand, three hundred eight".