211120111100220 has 192 divisors, whose sum is σ = 676870517621760. Its totient is φ = 48164199616512.

The previous prime is 211120111100209. The next prime is 211120111100243. The reversal of 211120111100220 is 22001111021112.

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 211120111100220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 962533284 + ... + 962752596.

It is an arithmetic number, because the mean of its divisors is an integer number (3525367279280).

Almost surely, 2^{211120111100220} is an apocalyptic number.

211120111100220 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 211120111100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338435258810880).

211120111100220 is an abundant number, since it is smaller than the sum of its proper divisors (465750406521540).

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

211120111100220 is a wasteful number, since it uses less digits than its factorization.

211120111100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223684 (or 223682 counting only the distinct ones).

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

Adding to 211120111100220 its reverse (22001111021112), we get a palindrome (233121222121332).

The spelling of 211120111100220 in words is "two hundred eleven trillion, one hundred twenty billion, one hundred eleven million, one hundred thousand, two hundred twenty".