201121110110220 has 96 divisors (see below), whose sum is σ = 570915837972480. Its totient is φ = 52891815974400.

The previous prime is 201121110110209. The next prime is 201121110110237. The reversal of 201121110110220 is 22011011121102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201121110110220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37572471 + ... + 42590289.

It is an arithmetic number, because the mean of its divisors is an integer number (5947039978880).

Almost surely, 2^{201121110110220} is an apocalyptic number.

201121110110220 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 201121110110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285457918986240).

201121110110220 is an abundant number, since it is smaller than the sum of its proper divisors (369794727862260).

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

201121110110220 is a wasteful number, since it uses less digits than its factorization.

201121110110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027055 (or 5027053 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201121110110220 its reverse (22011011121102), we get a palindrome (223132121231322).

The spelling of 201121110110220 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred ten million, one hundred ten thousand, two hundred twenty".