20911009201 has 4 divisors (see below), whose sum is σ = 21175705600. Its totient is φ = 20646312804.

The previous prime is 20911009187. The next prime is 20911009211. The reversal of 20911009201 is 10290011902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10290011902 = 2 ⋅5145005951.

It is a cyclic number.

It is not a de Polignac number, because 20911009201 - 2¹¹ = 20911007153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20911009211) 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, 132348081 + ... + 132348238.

It is an arithmetic number, because the mean of its divisors is an integer number (5293926400).

Almost surely, 2^20911009201 is an apocalyptic number.

It is an amenable number.

20911009201 is a deficient number, since it is larger than the sum of its proper divisors (264696399).

20911009201 is an equidigital number, since it uses as much as digits as its factorization.

20911009201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264696398.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 20911009201 in words is "twenty billion, nine hundred eleven million, nine thousand, two hundred one".