21233213320 has 64 divisors (see below), whose sum is σ = 52174290240. Its totient is φ = 7712812800.

The previous prime is 21233213311. The next prime is 21233213321. The reversal of 21233213320 is 2331233212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21233213291 and 21233213300.

It is not an unprimeable number, because it can be changed into a prime (21233213321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388399 + ... + 439681.

It is an arithmetic number, because the mean of its divisors is an integer number (815223285).

Almost surely, 2^21233213320 is an apocalyptic number.

21233213320 is a gapful number since it is divisible by the number (20) 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 21233213320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26087145120).

21233213320 is an abundant number, since it is smaller than the sum of its proper divisors (30941076920).

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

21233213320 is a wasteful number, since it uses less digits than its factorization.

21233213320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52246 (or 52242 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21233213320 its reverse (2331233212), we get a palindrome (23564446532).

The spelling of 21233213320 in words is "twenty-one billion, two hundred thirty-three million, two hundred thirteen thousand, three hundred twenty".