21033100320 has 96 divisors (see below), whose sum is σ = 69741362880. Its totient is φ = 5313623040.

The previous prime is 21033100289. The next prime is 21033100321. The reversal of 21033100320 is 2300133012.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21033100320.

It is not an unprimeable number, because it can be changed into a prime (21033100321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1144011 + ... + 1162250.

It is an arithmetic number, because the mean of its divisors is an integer number (726472530).

Almost surely, 2^21033100320 is an apocalyptic number.

21033100320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033100320 is an abundant number, since it is smaller than the sum of its proper divisors (48708262560).

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

21033100320 is a wasteful number, since it uses less digits than its factorization.

21033100320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306298 (or 2306290 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21033100320 its reverse (2300133012), we get a palindrome (23333233332).

The spelling of 21033100320 in words is "twenty-one billion, thirty-three million, one hundred thousand, three hundred twenty".