11121220121009 has 2 divisors, whose sum is σ = 11121220121010. Its totient is φ = 11121220121008.

The previous prime is 11121220121003. The next prime is 11121220121027. The reversal of 11121220121009 is 90012102212111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9197026675600 + 1924193445409 = 3032660^2 + 1387153^2 .

It is an emirp because it is prime and its reverse (90012102212111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11121220121009 is a prime.

It is not a weakly prime, because it can be changed into another prime (11121220121003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560610060504 + 5560610060505.

It is an arithmetic number, because the mean of its divisors is an integer number (5560610060505).

Almost surely, 2^{11121220121009} is an apocalyptic number.

It is an amenable number.

11121220121009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121220121009 is an equidigital number, since it uses as much as digits as its factorization.

11121220121009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 11121220121009 in words is "eleven trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, nine".