2121451009 has 2 divisors, whose sum is σ = 2121451010. Its totient is φ = 2121451008.

The previous prime is 2121450983. The next prime is 2121451019. The reversal of 2121451009 is 9001541212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1876622400 + 244828609 = 43320^2 + 15647^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121451009 - 2²³ = 2113062401 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121451019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060725504 + 1060725505.

It is an arithmetic number, because the mean of its divisors is an integer number (1060725505).

Almost surely, 2^2121451009 is an apocalyptic number.

It is an amenable number.

2121451009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121451009 is an equidigital number, since it uses as much as digits as its factorization.

2121451009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2121451009 is about 46059.2119884828. The cubic root of 2121451009 is about 1284.9246745351.

The spelling of 2121451009 in words is "two billion, one hundred twenty-one million, four hundred fifty-one thousand, nine".