111222212111001 has 24 divisors (see below), whose sum is σ = 171788763284424. Its totient is φ = 69095530713600.

The previous prime is 111222212110963. The next prime is 111222212111039. The reversal of 111222212111001 is 100111212222111.

It is a happy number.

111222212111001 is a `hidden beast` number, since 11 + 122 + 221 + 211 + 100 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (111222212110963) and next prime (111222212111039).

It can be written as a sum of positive squares in 4 ways, for example, as 32908579560000 + 78313632551001 = 5736600^2 + 8849499^2 .

It is not a de Polignac number, because 111222212111001 - 2¹⁵ = 111222212078233 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111222212111401) 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, 3598710106 + ... + 3598741011.

It is an arithmetic number, because the mean of its divisors is an integer number (7157865136851).

Almost surely, 2^{111222212111001} is an apocalyptic number.

It is an amenable number.

111222212111001 is a deficient number, since it is larger than the sum of its proper divisors (60566551173423).

111222212111001 is a wasteful number, since it uses less digits than its factorization.

111222212111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7197451241 (or 7197451238 counting only the distinct ones).

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

Adding to 111222212111001 its reverse (100111212222111), we get a palindrome (211333424333112).

The spelling of 111222212111001 in words is "one hundred eleven trillion, two hundred twenty-two billion, two hundred twelve million, one hundred eleven thousand, one".