20211012020209 has 2 divisors, whose sum is σ = 20211012020210. Its totient is φ = 20211012020208.

The previous prime is 20211012020201. The next prime is 20211012020263. The reversal of 20211012020209 is 90202021011202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19749491521600 + 461520498609 = 4444040^2 + 679353^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211012020209 - 2³ = 20211012020201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20211012020209.

It is not a weakly prime, because it can be changed into another prime (20211012020201) 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, 10105506010104 + 10105506010105.

It is an arithmetic number, because the mean of its divisors is an integer number (10105506010105).

Almost surely, 2^{20211012020209} is an apocalyptic number.

It is an amenable number.

20211012020209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211012020209 is an equidigital number, since it uses as much as digits as its factorization.

20211012020209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 20211012020209 in words is "twenty trillion, two hundred eleven billion, twelve million, twenty thousand, two hundred nine".