111221012211 has 32 divisors (see below), whose sum is σ = 161305005888. Its totient is φ = 67881369600.

The previous prime is 111221012191. The next prime is 111221012233. The reversal of 111221012211 is 112210122111.

It is a happy number.

It is not a de Polignac number, because 111221012211 - 2¹⁷ = 111220881139 is a prime.

It is a super-2 number, since 2×111221012211² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111221012261) 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 31 ways as a sum of consecutive naturals, for example, 11228361 + ... + 11238261.

It is an arithmetic number, because the mean of its divisors is an integer number (5040781434).

Almost surely, 2^111221012211 is an apocalyptic number.

111221012211 is a deficient number, since it is larger than the sum of its proper divisors (50083993677).

111221012211 is a wasteful number, since it uses less digits than its factorization.

111221012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15911.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111221012211 its reverse (112210122111), we get a palindrome (223431134322).

The spelling of 111221012211 in words is "one hundred eleven billion, two hundred twenty-one million, twelve thousand, two hundred eleven".