211101222222 has 64 divisors (see below), whose sum is σ = 511815628800. Its totient is φ = 63963181440.

The previous prime is 211101222193. The next prime is 211101222251. The reversal of 211101222222 is 222222101112.

It is a happy number.

211101222222 is a `hidden beast` number, since 211 + 10 + 1 + 222 + 222 = 666.

It is an interprime number because it is at equal distance from previous prime (211101222193) and next prime (211101222251).

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 = 211101222195 and 211101222204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9426883 + ... + 9449249.

It is an arithmetic number, because the mean of its divisors is an integer number (7997119200).

Almost surely, 2^211101222222 is an apocalyptic number.

211101222222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211101222222 is an abundant number, since it is smaller than the sum of its proper divisors (300714406578).

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

211101222222 is a wasteful number, since it uses less digits than its factorization.

211101222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38278 (or 38272 counting only the distinct ones).

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

Adding to 211101222222 its reverse (222222101112), we get a palindrome (433323323334).

The spelling of 211101222222 in words is "two hundred eleven billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty-two".