20021330100 has 72 divisors (see below), whose sum is σ = 61335949248. Its totient is φ = 5024960000.

The previous prime is 20021330093. The next prime is 20021330149. The reversal of 20021330100 is 103312002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 1957776 + ... + 1967975.

It is an arithmetic number, because the mean of its divisors is an integer number (851888184).

Almost surely, 2^20021330100 is an apocalyptic number.

20021330100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021330100 is an abundant number, since it is smaller than the sum of its proper divisors (41314619148).

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

20021330100 is a wasteful number, since it uses less digits than its factorization.

20021330100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3925785 (or 3925778 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 20021330100 its reverse (103312002), we get a palindrome (20124642102).

The spelling of 20021330100 in words is "twenty billion, twenty-one million, three hundred thirty thousand, one hundred".