111122212221211 has 16 divisors (see below), whose sum is σ = 116488370721600. Its totient is φ = 105801410767360.

The previous prime is 111122212221193. The next prime is 111122212221281. The reversal of 111122212221211 is 112122212221111.

It is a cyclic number.

It is not a de Polignac number, because 111122212221211 - 2²¹ = 111122210124059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111122212221281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2861536 + ... + 15180013.

It is an arithmetic number, because the mean of its divisors is an integer number (7280523170100).

Almost surely, 2^{111122212221211} is an apocalyptic number.

111122212221211 is a deficient number, since it is larger than the sum of its proper divisors (5366158500389).

111122212221211 is a wasteful number, since it uses less digits than its factorization.

111122212221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18042806.

The product of its digits is 128, while the sum is 22.

Adding to 111122212221211 its reverse (112122212221111), we get a palindrome (223244424442322).

The spelling of 111122212221211 in words is "one hundred eleven trillion, one hundred twenty-two billion, two hundred twelve million, two hundred twenty-one thousand, two hundred eleven".