111212111222201 has 32 divisors (see below), whose sum is σ = 125279061073920. Its totient is φ = 97874250552000.

The previous prime is 111212111222197. The next prime is 111212111222249. The reversal of 111212111222201 is 102222111212111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111212111222201 - 2² = 111212111222197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111212111227201) 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 31 ways as a sum of consecutive naturals, for example, 2889236 + ... + 15191178.

It is an arithmetic number, because the mean of its divisors is an integer number (3914970658560).

Almost surely, 2^{111212111222201} is an apocalyptic number.

111212111222201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111212111222201 is a deficient number, since it is larger than the sum of its proper divisors (14066949851719).

111212111222201 is a wasteful number, since it uses less digits than its factorization.

111212111222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12302237.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111212111222201 its reverse (102222111212111), we get a palindrome (213434222434312).

The spelling of 111212111222201 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, two hundred one".