20210201012809 has 2 divisors, whose sum is σ = 20210201012810. Its totient is φ = 20210201012808.

The previous prime is 20210201012801. The next prime is 20210201012891. The reversal of 20210201012809 is 90821010201202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12050340249600 + 8159860763209 = 3471360^2 + 2856547^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210201012809 - 2³ = 20210201012801 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210201012801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105100506404 + 10105100506405.

It is an arithmetic number, because the mean of its divisors is an integer number (10105100506405).

Almost surely, 2^{20210201012809} is an apocalyptic number.

It is an amenable number.

20210201012809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210201012809 is an equidigital number, since it uses as much as digits as its factorization.

20210201012809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 20210201012809 in words is "twenty trillion, two hundred ten billion, two hundred one million, twelve thousand, eight hundred nine".