20101201009 has 4 divisors (see below), whose sum is σ = 20749626880. Its totient is φ = 19452775140.

The previous prime is 20101201007. The next prime is 20101201033. The reversal of 20101201009 is 90010210102.

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.

It is a cyclic number.

It is not a de Polignac number, because 20101201009 - 2¹ = 20101201007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101200983 and 20101201001.

It is not an unprimeable number, because it can be changed into a prime (20101201007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324212889 + ... + 324212950.

It is an arithmetic number, because the mean of its divisors is an integer number (5187406720).

Almost surely, 2^20101201009 is an apocalyptic number.

It is an amenable number.

20101201009 is a deficient number, since it is larger than the sum of its proper divisors (648425871).

20101201009 is an equidigital number, since it uses as much as digits as its factorization.

20101201009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648425870.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 20101201009 in words is "twenty billion, one hundred one million, two hundred one thousand, nine".