1212112011111 has 4 divisors (see below), whose sum is σ = 1616149348152. Its totient is φ = 808074674072.

The previous prime is 1212112011109. The next prime is 1212112011113. The reversal of 1212112011111 is 1111102112121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1212112011109) and next prime (1212112011113).

It is a cyclic number.

It is not a de Polignac number, because 1212112011111 - 2¹ = 1212112011109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212112011113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202018668516 + ... + 202018668521.

It is an arithmetic number, because the mean of its divisors is an integer number (404037337038).

Almost surely, 2^{1212112011111} is an apocalyptic number.

1212112011111 is a deficient number, since it is larger than the sum of its proper divisors (404037337041).

1212112011111 is an equidigital number, since it uses as much as digits as its factorization.

1212112011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404037337040.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1212112011111 its reverse (1111102112121), we get a palindrome (2323214123232).

The spelling of 1212112011111 in words is "one trillion, two hundred twelve billion, one hundred twelve million, eleven thousand, one hundred eleven".