2021001220009 has 2 divisors, whose sum is σ = 2021001220010. Its totient is φ = 2021001220008.

The previous prime is 2021001219967. The next prime is 2021001220067. The reversal of 2021001220009 is 9000221001202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1502389518400 + 518611701609 = 1225720^2 + 720147^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021001220009 - 2¹⁷ = 2021001088937 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021001220709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500610004 + 1010500610005.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500610005).

Almost surely, 2^{2021001220009} is an apocalyptic number.

It is an amenable number.

2021001220009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021001220009 is an equidigital number, since it uses as much as digits as its factorization.

2021001220009 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 19.

The spelling of 2021001220009 in words is "two trillion, twenty-one billion, one million, two hundred twenty thousand, nine".