211112102221220 has 12 divisors (see below), whose sum is σ = 443335414664604. Its totient is φ = 84444840888480.

The previous prime is 211112102221187. The next prime is 211112102221249. The reversal of 211112102221220 is 22122201211112.

It can be written as a sum of positive squares in 2 ways, for example, as 70489692722596 + 140622409498624 = 8395814^2 + 11858432^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10555605111061 = 211112102221220 / (2 + 1 + 1 + 1 + 1 + 2 + 1 + 0 + 2 + 2 + 2 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 211112102221192 and 211112102221201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5277802555511 + ... + 5277802555550.

It is an arithmetic number, because the mean of its divisors is an integer number (36944617888717).

Almost surely, 2^{211112102221220} is an apocalyptic number.

211112102221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211112102221220 is an abundant number, since it is smaller than the sum of its proper divisors (232223312443384).

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

211112102221220 is a wasteful number, since it uses less digits than its factorization.

211112102221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555605111070 (or 10555605111068 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211112102221220 its reverse (22122201211112), we get a palindrome (233234303432332).

The spelling of 211112102221220 in words is "two hundred eleven trillion, one hundred twelve billion, one hundred two million, two hundred twenty-one thousand, two hundred twenty".