211100001222222 has 128 divisors (see below), whose sum is σ = 539918538393600. Its totient is φ = 59888273073408.

The previous prime is 211100001222199. The next prime is 211100001222241. The reversal of 211100001222222 is 222222100001112.

It is a happy number.

211100001222222 is a `hidden beast` number, since 211 + 10 + 0 + 0 + 0 + 1 + 222 + 222 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 211100001222195 and 211100001222204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 83801679 + ... + 86283957.

It is an arithmetic number, because the mean of its divisors is an integer number (4218113581200).

Almost surely, 2^{211100001222222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211100001222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269959269196800).

211100001222222 is an abundant number, since it is smaller than the sum of its proper divisors (328818537171378).

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

211100001222222 is a wasteful number, since it uses less digits than its factorization.

211100001222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483887 (or 2483881 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211100001222222 its reverse (222222100001112), we get a palindrome (433322101223334).

The spelling of 211100001222222 in words is "two hundred eleven trillion, one hundred billion, one million, two hundred twenty-two thousand, two hundred twenty-two".