11212133111111 has 2 divisors, whose sum is σ = 11212133111112. Its totient is φ = 11212133111110.

The previous prime is 11212133111083. The next prime is 11212133111147. The reversal of 11212133111111 is 11111133121211.

It is a m-pointer prime, because the next prime (11212133111147) can be obtained adding 11212133111111 to its product of digits (36).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11212133111111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212133101111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606066555555 + 5606066555556.

It is an arithmetic number, because the mean of its divisors is an integer number (5606066555556).

Almost surely, 2^{11212133111111} is an apocalyptic number.

11212133111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212133111111 is an equidigital number, since it uses as much as digits as its factorization.

11212133111111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 20.

Adding to 11212133111111 its reverse (11111133121211), we get a palindrome (22323266232322).

It can be divided in two parts, 1121213 and 3111111, that added together give a palindrome (4232324).

The spelling of 11212133111111 in words is "eleven trillion, two hundred twelve billion, one hundred thirty-three million, one hundred eleven thousand, one hundred eleven".