2121044209 has 2 divisors, whose sum is σ = 2121044210. Its totient is φ = 2121044208.

The previous prime is 2121044171. The next prime is 2121044213. The reversal of 2121044209 is 9024401212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2075075809 + 45968400 = 45553^2 + 6780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121044209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121044279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060522104 + 1060522105.

It is an arithmetic number, because the mean of its divisors is an integer number (1060522105).

Almost surely, 2^2121044209 is an apocalyptic number.

It is an amenable number.

2121044209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121044209 is an equidigital number, since it uses as much as digits as its factorization.

2121044209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2121044209 is about 46054.7957220527. The cubic root of 2121044209 is about 1284.8425388066.

The spelling of 2121044209 in words is "two billion, one hundred twenty-one million, forty-four thousand, two hundred nine".