20121330220 has 144 divisors (see below), whose sum is σ = 48154448160. Its totient is φ = 7038959616.

The previous prime is 20121330149. The next prime is 20121330337. The reversal of 20121330220 is 2203312102.

It is a junction number, because it is equal to n+sod(n) for n = 20121330194 and 20121330203.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5818732 + ... + 5822188.

It is an arithmetic number, because the mean of its divisors is an integer number (334405890).

Almost surely, 2^20121330220 is an apocalyptic number.

20121330220 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 20121330220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24077224080).

20121330220 is an abundant number, since it is smaller than the sum of its proper divisors (28033117940).

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

20121330220 is a wasteful number, since it uses less digits than its factorization.

20121330220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3572 (or 3553 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20121330220 its reverse (2203312102), we get a palindrome (22324642322).

The spelling of 20121330220 in words is "twenty billion, one hundred twenty-one million, three hundred thirty thousand, two hundred twenty".