111221121211201 has 4 divisors (see below), whose sum is σ = 111233851118212. Its totient is φ = 111208391304192.

The previous prime is 111221121211177. The next prime is 111221121211253. The reversal of 111221121211201 is 102112121122111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75289200994225 + 35931920216976 = 8676935^2 + 5994324^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221121211201 - 2⁵ = 111221121211169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111221121811201) 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, 6364940400 + ... + 6364957873.

It is an arithmetic number, because the mean of its divisors is an integer number (27808462779553).

Almost surely, 2^{111221121211201} is an apocalyptic number.

It is an amenable number.

111221121211201 is a deficient number, since it is larger than the sum of its proper divisors (12729907011).

111221121211201 is an equidigital number, since it uses as much as digits as its factorization.

111221121211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12729907010.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111221121211201 its reverse (102112121122111), we get a palindrome (213333242333312).

The spelling of 111221121211201 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, two hundred one".