20010221000009 has 2 divisors, whose sum is σ = 20010221000010. Its totient is φ = 20010221000008.

The previous prime is 20010220999999. The next prime is 20010221000089. The reversal of 20010221000009 is 90000012201002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18169119375625 + 1841101624384 = 4262525^2 + 1356872^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010221000009 - 2³² = 20005926032713 is a prime.

It is not a weakly prime, because it can be changed into another prime (20010221000089) 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, 10005110500004 + 10005110500005.

It is an arithmetic number, because the mean of its divisors is an integer number (10005110500005).

Almost surely, 2^{20010221000009} is an apocalyptic number.

It is an amenable number.

20010221000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010221000009 is an equidigital number, since it uses as much as digits as its factorization.

20010221000009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 20010221000009 in words is "twenty trillion, ten billion, two hundred twenty-one million, nine", and thus it is an aban number.