111210012222221 has 16 divisors (see below), whose sum is σ = 123871046265600. Its totient is φ = 99820264040640.

The previous prime is 111210012222203. The next prime is 111210012222289. The reversal of 111210012222221 is 122222210012111.

It is a de Polignac number, because none of the positive numbers 2^k-111210012222221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111210012222193 and 111210012222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111210012224221) 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 15 ways as a sum of consecutive naturals, for example, 528715916 + ... + 528926213.

It is an arithmetic number, because the mean of its divisors is an integer number (7741940391600).

Almost surely, 2^{111210012222221} is an apocalyptic number.

111210012222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111210012222221 is a deficient number, since it is larger than the sum of its proper divisors (12661034043379).

111210012222221 is an equidigital number, since it uses as much as digits as its factorization.

111210012222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057642241 (or 1057642219 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111210012222221 its reverse (122222210012111), we get a palindrome (233432222234332).

The spelling of 111210012222221 in words is "one hundred eleven trillion, two hundred ten billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".