111221211220209 has 40 divisors (see below), whose sum is σ = 168500748854592. Its totient is φ = 73096458009120.

The previous prime is 111221211220169. The next prime is 111221211220219. The reversal of 111221211220209 is 902022112122111.

111221211220209 is a `hidden beast` number, since 1 + 1 + 1 + 2 + 21 + 211 + 220 + 209 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-111221211220209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (111221211220219) 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 39 ways as a sum of consecutive naturals, for example, 62399427 + ... + 64157079.

Almost surely, 2^{111221211220209} is an apocalyptic number.

It is an amenable number.

111221211220209 is a deficient number, since it is larger than the sum of its proper divisors (57279537634383).

111221211220209 is a wasteful number, since it uses less digits than its factorization.

111221211220209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768739 (or 1768730 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The spelling of 111221211220209 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred nine".