11212011011111 has 4 divisors (see below), whose sum is σ = 11323021021224. Its totient is φ = 11101001001000.

The previous prime is 11212011011107. The next prime is 11212011011137. The reversal of 11212011011111 is 11111011021211.

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

It is not a de Polignac number, because 11212011011111 - 2² = 11212011011107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212011011141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55505004905 + ... + 55505005106.

It is an arithmetic number, because the mean of its divisors is an integer number (2830755255306).

Almost surely, 2^{11212011011111} is an apocalyptic number.

11212011011111 is a deficient number, since it is larger than the sum of its proper divisors (111010010113).

11212011011111 is a wasteful number, since it uses less digits than its factorization.

11212011011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111010010112.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 11212011011111 its reverse (11111011021211), we get a palindrome (22323022032322).

It can be divided in two parts, 1121201 and 1011111, that added together give a palindrome (2132312).

The spelling of 11212011011111 in words is "eleven trillion, two hundred twelve billion, eleven million, eleven thousand, one hundred eleven".