20971408201 has 4 divisors (see below), whose sum is σ = 21482906004. Its totient is φ = 20459910400.

The previous prime is 20971408189. The next prime is 20971408219. The reversal of 20971408201 is 10280417902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12566185801 + 8405222400 = 112099^2 + 91680^2 .

It is a cyclic number.

It is not a de Polignac number, because 20971408201 - 2⁵ = 20971408169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20971108201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255748840 + ... + 255748921.

It is an arithmetic number, because the mean of its divisors is an integer number (5370726501).

Almost surely, 2^20971408201 is an apocalyptic number.

It is an amenable number.

20971408201 is a deficient number, since it is larger than the sum of its proper divisors (511497803).

20971408201 is an equidigital number, since it uses as much as digits as its factorization.

20971408201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511497802.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 20971408201 in words is "twenty billion, nine hundred seventy-one million, four hundred eight thousand, two hundred one".