11105921 has 2 divisors, whose sum is σ = 11105922. Its totient is φ = 11105920.

The previous prime is 11105909. The next prime is 11105923. The reversal of 11105921 is 12950111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 83521 = 3320^2 + 289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11105921 is a prime.

Together with 11105923, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11105893 and 11105902.

It is not a weakly prime, because it can be changed into another prime (11105923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5552960 + 5552961.

It is an arithmetic number, because the mean of its divisors is an integer number (5552961).

Almost surely, 2^11105921 is an apocalyptic number.

It is an amenable number.

11105921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11105921 is an equidigital number, since it uses as much as digits as its factorization.

11105921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 11105921 is about 3332.5547257322. The cubic root of 11105921 is about 223.1095669689.

The spelling of 11105921 in words is "eleven million, one hundred five thousand, nine hundred twenty-one".