11100121 has 2 divisors, whose sum is σ = 11100122.
Its totient is φ = 11100120.
The previous prime is 11100119. The next prime is 11100143. The reversal of 11100121 is 12100111.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 9834496 + 1265625 = 3136^2 + 1125^2
It is an emirp because it is prime and its reverse (12100111) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 11100121 - 21 = 11100119 is a prime.
Together with 11100119, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (11100101) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550060 + 5550061.
It is an arithmetic number, because the mean of its divisors is an integer number (5550061).
Almost surely, 211100121 is an apocalyptic number.
It is an amenable number.
11100121 is a deficient number, since it is larger than the sum of its proper divisors (1).
11100121 is an equidigital number, since it uses as much as digits as its factorization.
11100121 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 2, while the sum is 7.
The square root of 11100121 is about 3331.6844088239.
The cubic root of 11100121 is about 223.0707209989.
Adding to 11100121 its reverse (12100111), we get a palindrome (23200232).
Multiplying 11100121 by its reverse (12100111), we get a palindrome (134312696213431).
The spelling of 11100121 in words is "eleven million, one hundred thousand, one hundred twenty-one".