111212122222 has 4 divisors (see below), whose sum is σ = 166818183336. Its totient is φ = 55606061110.

The previous prime is 111212122199. The next prime is 111212122247. The reversal of 111212122222 is 222221212111.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×111212122222² (a number of 23 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 111212122222.

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 as a sum of consecutive naturals, namely, 27803030554 + ... + 27803030557.

It is an arithmetic number, because the mean of its divisors is an integer number (41704545834).

Almost surely, 2^111212122222 is an apocalyptic number.

111212122222 is a deficient number, since it is larger than the sum of its proper divisors (55606061114).

111212122222 is an equidigital number, since it uses as much as digits as its factorization.

111212122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55606061113.

The product of its digits is 128, while the sum is 19.

Adding to 111212122222 its reverse (222221212111), we get a palindrome (333433334333).

The spelling of 111212122222 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-two".