21033100000 has 144 divisors (see below), whose sum is σ = 56466042192. Its totient is φ = 7648000000.

The previous prime is 21033099977. The next prime is 21033100037. The reversal of 21033100000 is 133012.

It is a super-2 number, since 2×21033100000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 21033100000.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1090440 + ... + 1109560.

It is an arithmetic number, because the mean of its divisors is an integer number (392125293).

Almost surely, 2^21033100000 is an apocalyptic number.

21033100000 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 21033100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28233021096).

21033100000 is an abundant number, since it is smaller than the sum of its proper divisors (35432942192).

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

21033100000 is an equidigital number, since it uses as much as digits as its factorization.

21033100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19167 (or 19139 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

Adding to 21033100000 its reverse (133012), we get a palindrome (21033233012).

The spelling of 21033100000 in words is "twenty-one billion, thirty-three million, one hundred thousand".