21233223306 has 128 divisors (see below), whose sum is σ = 51231398400. Its totient is φ = 6498455040.

The previous prime is 21233223299. The next prime is 21233223307. The reversal of 21233223306 is 60332233212.

21233223306 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 322 + 330 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21233223306.

It is not an unprimeable number, because it can be changed into a prime (21233223307) 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, 6517630 + ... + 6520886.

It is an arithmetic number, because the mean of its divisors is an integer number (400245300).

Almost surely, 2^21233223306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21233223306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25615699200).

21233223306 is an abundant number, since it is smaller than the sum of its proper divisors (29998175094).

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

21233223306 is a wasteful number, since it uses less digits than its factorization.

21233223306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501 (or 3495 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 27.

Adding to 21233223306 its reverse (60332233212), we get a palindrome (81565456518).

The spelling of 21233223306 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty-three thousand, three hundred six".