20011001010109 has 4 divisors (see below), whose sum is σ = 21188118716604. Its totient is φ = 18833883303616.

The previous prime is 20011001010083. The next prime is 20011001010113. The reversal of 20011001010109 is 90101010011002.

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 18556753140025 + 1454247870084 = 4307755^2 + 1205922^2 .

It is not a de Polignac number, because 20011001010109 - 2⁷ = 20011001009981 is a prime.

It is a super-2 number, since 2×20011001010109² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011001010092 and 20011001010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011001010149) 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, 588558853222 + ... + 588558853255.

It is an arithmetic number, because the mean of its divisors is an integer number (5297029679151).

Almost surely, 2^{20011001010109} is an apocalyptic number.

It is an amenable number.

20011001010109 is a deficient number, since it is larger than the sum of its proper divisors (1177117706495).

20011001010109 is a wasteful number, since it uses less digits than its factorization.

20011001010109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177117706494.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 20011001010109 in words is "twenty trillion, eleven billion, one million, ten thousand, one hundred nine".