20001000221120 has 168 divisors, whose sum is σ = 49908599395200. Its totient is φ = 7626748631040.

The previous prime is 20001000221057. The next prime is 20001000221203. The reversal of 20001000221120 is 2112200010002.

It is a happy number.

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, 44306306 + ... + 44755454.

It is an arithmetic number, because the mean of its divisors is an integer number (297074996400).

Almost surely, 2^{20001000221120} is an apocalyptic number.

20001000221120 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 20001000221120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24954299697600).

20001000221120 is an abundant number, since it is smaller than the sum of its proper divisors (29907599174080).

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

20001000221120 is an equidigital number, since it uses as much as digits as its factorization.

20001000221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449331 (or 449254 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001000221120 its reverse (2112200010002), we get a palindrome (22113200231122).

The spelling of 20001000221120 in words is "twenty trillion, one billion, two hundred twenty-one thousand, one hundred twenty".