211212111222 has 128 divisors (see below), whose sum is σ = 551949189120. Its totient is φ = 58620931200.

The previous prime is 211212111217. The next prime is 211212111239. The reversal of 211212111222 is 222111212112.

211212111222 is a `hidden beast` number, since 211 + 21 + 211 + 1 + 222 = 666.

211212111222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211212111222² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 211212111195 and 211212111204.

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, 1971243 + ... + 2075625.

It is an arithmetic number, because the mean of its divisors is an integer number (4312103040).

Almost surely, 2^211212111222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211212111222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275974594560).

211212111222 is an abundant number, since it is smaller than the sum of its proper divisors (340737077898).

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

211212111222 is a wasteful number, since it uses less digits than its factorization.

211212111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104555 (or 104549 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 211212111222 its reverse (222111212112), we get a palindrome (433323323334).

The spelling of 211212111222 in words is "two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-two".