11212211100220 has 144 divisors (see below), whose sum is σ = 27253601952192. Its totient is φ = 3863313991680.

The previous prime is 11212211100143. The next prime is 11212211100227. The reversal of 11212211100220 is 2200111221211.

It is a junction number, because it is equal to n+sod(n) for n = 11212211100194 and 11212211100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212211100227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1428474 + ... + 4946206.

It is an arithmetic number, because the mean of its divisors is an integer number (189261124668).

Almost surely, 2^{11212211100220} is an apocalyptic number.

11212211100220 is a gapful number since it is divisible by the number (10) 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 11212211100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13626800976096).

11212211100220 is an abundant number, since it is smaller than the sum of its proper divisors (16041390851972).

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

11212211100220 is a wasteful number, since it uses less digits than its factorization.

11212211100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517832 (or 3517817 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11212211100220 its reverse (2200111221211), we get a palindrome (13412322321431).

The spelling of 11212211100220 in words is "eleven trillion, two hundred twelve billion, two hundred eleven million, one hundred thousand, two hundred twenty".