21033310100 has 72 divisors (see below), whose sum is σ = 49829060736. Its totient is φ = 7642720000.

The previous prime is 21033310091. The next prime is 21033310127. The reversal of 21033310100 is 101333012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1622645 + ... + 1635555.

It is an arithmetic number, because the mean of its divisors is an integer number (692070288).

Almost surely, 2^21033310100 is an apocalyptic number.

21033310100 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 21033310100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24914530368).

21033310100 is an abundant number, since it is smaller than the sum of its proper divisors (28795750636).

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

21033310100 is a wasteful number, since it uses less digits than its factorization.

21033310100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14417 (or 14410 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21033310100 its reverse (101333012), we get a palindrome (21134643112).

It can be divided in two parts, 21033 and 310100, that added together give a palindrome (331133).

The spelling of 21033310100 in words is "twenty-one billion, thirty-three million, three hundred ten thousand, one hundred".