1001220211009 has 2 divisors, whose sum is σ = 1001220211010. Its totient is φ = 1001220211008.

The previous prime is 1001220210997. The next prime is 1001220211049. The reversal of 1001220211009 is 9001120221001.

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., 891377680384 + 109842530625 = 944128^2 + 331425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001220211009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001220211049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610105504 + 500610105505.

It is an arithmetic number, because the mean of its divisors is an integer number (500610105505).

Almost surely, 2^{1001220211009} is an apocalyptic number.

It is an amenable number.

1001220211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001220211009 is an equidigital number, since it uses as much as digits as its factorization.

1001220211009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 1001220211009 in words is "one trillion, one billion, two hundred twenty million, two hundred eleven thousand, nine".