111221212100211 has 24 divisors (see below), whose sum is σ = 162965674400256. Its totient is φ = 73084168270320.

The previous prime is 111221212100197. The next prime is 111221212100261. The reversal of 111221212100211 is 112001212122111.

It is a happy number.

111221212100211 is a `hidden beast` number, since 1 + 1 + 1 + 221 + 21 + 210 + 0 + 211 = 666.

It is not a de Polignac number, because 111221212100211 - 2¹¹ = 111221212098163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111221212100261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172404855 + ... + 173048768.

It is an arithmetic number, because the mean of its divisors is an integer number (6790236433344).

Almost surely, 2^{111221212100211} is an apocalyptic number.

111221212100211 is a deficient number, since it is larger than the sum of its proper divisors (51744462300045).

111221212100211 is a wasteful number, since it uses less digits than its factorization.

111221212100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345454143 (or 345454140 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111221212100211 its reverse (112001212122111), we get a palindrome (223222424222322).

The spelling of 111221212100211 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, one hundred thousand, two hundred eleven".