11211100001111 has 4 divisors (see below), whose sum is σ = 11234505220800. Its totient is φ = 11187694781424.

The previous prime is 11211100000993. The next prime is 11211100001117. The reversal of 11211100001111 is 11110000111211.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11211100001111 - 2²⁶ = 11211032892247 is a prime.

It is a super-2 number, since 2×11211100001111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211100001092 and 11211100001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211100001117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11702609126 + ... + 11702610083.

It is an arithmetic number, because the mean of its divisors is an integer number (2808626305200).

Almost surely, 2^{11211100001111} is an apocalyptic number.

11211100001111 is a deficient number, since it is larger than the sum of its proper divisors (23405219689).

11211100001111 is an equidigital number, since it uses as much as digits as its factorization.

11211100001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23405219688.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11211100001111 its reverse (11110000111211), we get a palindrome (22321100112322).

The spelling of 11211100001111 in words is "eleven trillion, two hundred eleven billion, one hundred million, one thousand, one hundred eleven".