111121222021209 has 24 divisors (see below), whose sum is σ = 167488728144192. Its totient is φ = 70859203636320.

The previous prime is 111121222021193. The next prime is 111121222021213. The reversal of 111121222021209 is 902120222121111.

111121222021209 is a `hidden beast` number, since 1 + 1 + 1 + 1 + 212 + 220 + 21 + 209 = 666.

It is not a de Polignac number, because 111121222021209 - 2⁴ = 111121222021193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111121222021289) 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, 18556314 + ... + 23802924.

It is an arithmetic number, because the mean of its divisors is an integer number (6978697006008).

Almost surely, 2^{111121222021209} is an apocalyptic number.

It is an amenable number.

111121222021209 is a deficient number, since it is larger than the sum of its proper divisors (56367506122983).

111121222021209 is a wasteful number, since it uses less digits than its factorization.

111121222021209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5348957 (or 5348954 counting only the distinct ones).

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

The spelling of 111121222021209 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, two hundred nine".