111101111221221 has 48 divisors (see below), whose sum is σ = 176049256481280. Its totient is φ = 66957468329760.

The previous prime is 111101111221169. The next prime is 111101111221231. The reversal of 111101111221221 is 122122111101111.

111101111221221 is a `hidden beast` number, since 1 + 1 + 110 + 1 + 111 + 221 + 221 = 666.

It is not a de Polignac number, because 111101111221221 - 2¹¹ = 111101111219173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111101111221194 and 111101111221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101111221231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15908626 + ... + 21801068.

It is an arithmetic number, because the mean of its divisors is an integer number (3667692843360).

Almost surely, 2^{111101111221221} is an apocalyptic number.

111101111221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111101111221221 is a deficient number, since it is larger than the sum of its proper divisors (64948145260059).

111101111221221 is a wasteful number, since it uses less digits than its factorization.

111101111221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5893526 (or 5893523 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111101111221221 its reverse (122122111101111), we get a palindrome (233223222322332).

The spelling of 111101111221221 in words is "one hundred eleven trillion, one hundred one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".