11201212111 has 2 divisors, whose sum is σ = 11201212112. Its totient is φ = 11201212110.

The previous prime is 11201212109. The next prime is 11201212117. The reversal of 11201212111 is 11121210211.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (11121210211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11201212111 - 2¹ = 11201212109 is a prime.

It is a super-2 number, since 2×11201212111² (a number of 21 digits) contains 22 as substring.

Together with 11201212109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11201212091 and 11201212100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11201212117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5600606055 + 5600606056.

It is an arithmetic number, because the mean of its divisors is an integer number (5600606056).

Almost surely, 2^11201212111 is an apocalyptic number.

11201212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11201212111 is an equidigital number, since it uses as much as digits as its factorization.

11201212111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11201212111 its reverse (11121210211), we get a palindrome (22322422322).

The spelling of 11201212111 in words is "eleven billion, two hundred one million, two hundred twelve thousand, one hundred eleven".