21133000320 has 128 divisors (see below), whose sum is σ = 67421592000. Its totient is φ = 5630435328.

The previous prime is 21133000319. The next prime is 21133000391. The reversal of 21133000320 is 2300033112.

It is a tau number, because it is divible by the number of its divisors (128).

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 21133000320.

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, 2470611 + ... + 2479149.

Almost surely, 2^21133000320 is an apocalyptic number.

21133000320 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 21133000320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33710796000).

21133000320 is an abundant number, since it is smaller than the sum of its proper divisors (46288591680).

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

21133000320 is a wasteful number, since it uses less digits than its factorization.

21133000320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9850 (or 9838 counting only the distinct ones).

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

Adding to 21133000320 its reverse (2300033112), we get a palindrome (23433033432).

The spelling of 21133000320 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty", and thus it is an aban number.