111212220001 has 4 divisors (see below), whose sum is σ = 111283832772. Its totient is φ = 111140607232.

The previous prime is 111212219873. The next prime is 111212220013. The reversal of 111212220001 is 100022212111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100022212111 = 317 ⋅315527483.

It can be written as a sum of positive squares in 2 ways, for example, as 17808635601 + 93403584400 = 133449^2 + 305620^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212220001 - 2⁷ = 111212219873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111212220071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35804056 + ... + 35807161.

It is an arithmetic number, because the mean of its divisors is an integer number (27820958193).

Almost surely, 2^111212220001 is an apocalyptic number.

It is an amenable number.

111212220001 is a deficient number, since it is larger than the sum of its proper divisors (71612771).

111212220001 is an equidigital number, since it uses as much as digits as its factorization.

111212220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71612770.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111212220001 its reverse (100022212111), we get a palindrome (211234432112).

The spelling of 111212220001 in words is "one hundred eleven billion, two hundred twelve million, two hundred twenty thousand, one".