210111222222 has 144 divisors (see below), whose sum is σ = 517352209920. Its totient is φ = 61518204000.

The previous prime is 210111222179. The next prime is 210111222241. The reversal of 210111222222 is 222222111012.

It is a happy number.

210111222222 is a `hidden beast` number, since 210 + 1 + 11 + 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 = 210111222195 and 210111222204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 49893697 + ... + 49897907.

It is an arithmetic number, because the mean of its divisors is an integer number (3592723680).

Almost surely, 2^210111222222 is an apocalyptic number.

210111222222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 210111222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258676104960).

210111222222 is an abundant number, since it is smaller than the sum of its proper divisors (307240987698).

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

210111222222 is a wasteful number, since it uses less digits than its factorization.

210111222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011 (or 4997 counting only the distinct ones).

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

Adding to 210111222222 its reverse (222222111012), we get a palindrome (432333333234).

The spelling of 210111222222 in words is "two hundred ten billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-two".