111212121211011 has 12 divisors (see below), whose sum is σ = 164981344980192. Its totient is φ = 72137592136656.

The previous prime is 111212121210979. The next prime is 111212121211049. The reversal of 111212121211011 is 110112121212111.

111212121211011 is a `hidden beast` number, since 111 + 212 + 121 + 211 + 0 + 11 = 666.

It is not a de Polignac number, because 111212121211011 - 2⁵ = 111212121210979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111212121211811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166985166651 + ... + 166985167316.

It is an arithmetic number, because the mean of its divisors is an integer number (13748445415016).

Almost surely, 2^{111212121211011} is an apocalyptic number.

111212121211011 is a deficient number, since it is larger than the sum of its proper divisors (53769223769181).

111212121211011 is a wasteful number, since it uses less digits than its factorization.

111212121211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333970334010 (or 333970334007 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111212121211011 its reverse (110112121212111), we get a palindrome (221324242423122).

The spelling of 111212121211011 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, eleven".