111211222122201 has 4 divisors (see below), whose sum is σ = 148281629496272. Its totient is φ = 74140814748132.

The previous prime is 111211222122181. The next prime is 111211222122227. The reversal of 111211222122201 is 102221222112111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 111211222122201 - 2⁶ = 111211222122137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111211222122241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18535203687031 + ... + 18535203687036.

It is an arithmetic number, because the mean of its divisors is an integer number (37070407374068).

Almost surely, 2^{111211222122201} is an apocalyptic number.

It is an amenable number.

111211222122201 is a deficient number, since it is larger than the sum of its proper divisors (37070407374071).

111211222122201 is an equidigital number, since it uses as much as digits as its factorization.

111211222122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37070407374070.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111211222122201 its reverse (102221222112111), we get a palindrome (213432444234312).

The spelling of 111211222122201 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred one".