12101121 has 6 divisors (see below), whose sum is σ = 17479410.
Its totient is φ = 8067408.
The previous prime is 12101099. The next prime is 12101123. The reversal of 12101121 is 12110121.
Adding to 12101121 its reverse (12110121), we get a palindrome (24211242).
It is a happy number.
It can be written as a sum of positive squares in only one way, i.e., 9000000 + 3101121 = 3000^2 + 1761^2
It is not a de Polignac number, because 12101121 - 27 = 12100993 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1344569 = 12101121 / (1 + 2 + 1 + 0 + 1 + 1 + 2 + 1).
It is not an unprimeable number, because it can be changed into a prime (12101123) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 672276 + ... + 672293.
It is an arithmetic number, because the mean of its divisors is an integer number (2913235).
Almost surely, 212101121 is an apocalyptic number.
It is an amenable number.
12101121 is a deficient number, since it is larger than the sum of its proper divisors (5378289).
12101121 is a wasteful number, since it uses less digits than its factorization.
12101121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1344575 (or 1344572 counting only the distinct ones).
The product of its (nonzero) digits is 4, while the sum is 9.
The square root of 12101121 is about 3478.6665548742.
Note that the first 3 decimals coincide.
The cubic root of 12101121 is about 229.5841319409.
The spelling of 12101121 in words is "twelve million, one hundred one thousand, one hundred twenty-one".