20110121200220 has 96 divisors (see below), whose sum is σ = 44248460457600. Its totient is φ = 7667218944000.

The previous prime is 20110121200121. The next prime is 20110121200259. The reversal of 20110121200220 is 2200212101102.

It is a junction number, because it is equal to n+sod(n) for n = 20110121200195 and 20110121200204.

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 31 ways as a sum of consecutive naturals, for example, 32263520 + ... + 32880920.

It is an arithmetic number, because the mean of its divisors is an integer number (460921463100).

Almost surely, 2^{20110121200220} is an apocalyptic number.

20110121200220 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 20110121200220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22124230228800).

20110121200220 is an abundant number, since it is smaller than the sum of its proper divisors (24138339257380).

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

20110121200220 is a wasteful number, since it uses less digits than its factorization.

20110121200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618159 (or 618157 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20110121200220 its reverse (2200212101102), we get a palindrome (22310333301322).

The spelling of 20110121200220 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, two hundred thousand, two hundred twenty".