11103121111 has 4 divisors (see below), whose sum is σ = 11109905352. Its totient is φ = 11096336872.

The previous prime is 11103121027. The next prime is 11103121121. The reversal of 11103121111 is 11112130111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11112130111 = 1847 ⋅6016313.

It is a cyclic number.

It is not a de Polignac number, because 11103121111 - 2⁹ = 11103120599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11103121091 and 11103121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11103121121) 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, 3389665 + ... + 3392938.

It is an arithmetic number, because the mean of its divisors is an integer number (2777476338).

Almost surely, 2^11103121111 is an apocalyptic number.

11103121111 is a deficient number, since it is larger than the sum of its proper divisors (6784241).

11103121111 is an equidigital number, since it uses as much as digits as its factorization.

11103121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6784240.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 11103121111 its reverse (11112130111), we get a palindrome (22215251222).

The spelling of 11103121111 in words is "eleven billion, one hundred three million, one hundred twenty-one thousand, one hundred eleven".