111222121120211 has 16 divisors (see below), whose sum is σ = 112557204141984. Its totient is φ = 109890904510464.

The previous prime is 111222121120183. The next prime is 111222121120217. The reversal of 111222121120211 is 112021121222111.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111222121120211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111222121120217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1355119871 + ... + 1355201943.

It is an arithmetic number, because the mean of its divisors is an integer number (7034825258874).

Almost surely, 2^{111222121120211} is an apocalyptic number.

111222121120211 is a deficient number, since it is larger than the sum of its proper divisors (1335083021773).

111222121120211 is an equidigital number, since it uses as much as digits as its factorization.

111222121120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105430.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111222121120211 its reverse (112021121222111), we get a palindrome (223243242342322).

The spelling of 111222121120211 in words is "one hundred eleven trillion, two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty thousand, two hundred eleven".