11112220121 has 2 divisors, whose sum is σ = 11112220122. Its totient is φ = 11112220120.

The previous prime is 11112220117. The next prime is 11112220127. The reversal of 11112220121 is 12102221111.

11112220121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7874610121 + 3237610000 = 88739^2 + 56900^2 .

It is an emirp because it is prime and its reverse (12102221111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11112220121 - 2² = 11112220117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11112220096 and 11112220105.

It is not a weakly prime, because it can be changed into another prime (11112220127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556110060 + 5556110061.

It is an arithmetic number, because the mean of its divisors is an integer number (5556110061).

Almost surely, 2^11112220121 is an apocalyptic number.

It is an amenable number.

11112220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112220121 is an equidigital number, since it uses as much as digits as its factorization.

11112220121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11112220121 its reverse (12102221111), we get a palindrome (23214441232).

The spelling of 11112220121 in words is "eleven billion, one hundred twelve million, two hundred twenty thousand, one hundred twenty-one".