21233325320 has 64 divisors (see below), whose sum is σ = 48508243200. Its totient is φ = 8363272960.

The previous prime is 21233325319. The next prime is 21233325331. The reversal of 21233325320 is 2352333212.

It is a self number, because there is not a number n which added to its sum of digits gives 21233325320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2514866 + ... + 2523294.

It is an arithmetic number, because the mean of its divisors is an integer number (757941300).

Almost surely, 2^21233325320 is an apocalyptic number.

21233325320 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 21233325320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24254121600).

21233325320 is an abundant number, since it is smaller than the sum of its proper divisors (27274917880).

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

21233325320 is a wasteful number, since it uses less digits than its factorization.

21233325320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9398 (or 9394 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 21233325320 its reverse (2352333212), we get a palindrome (23585658532).

The spelling of 21233325320 in words is "twenty-one billion, two hundred thirty-three million, three hundred twenty-five thousand, three hundred twenty".