20110101112009 has 4 divisors (see below), whose sum is σ = 20128500107716. Its totient is φ = 20091702116304.

The previous prime is 20110101111959. The next prime is 20110101112033. The reversal of 20110101112009 is 90021110101102.

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 19807199478784 + 302901633225 = 4450528^2 + 550365^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110101112009 - 2¹⁹ = 20110100587721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110101112039) 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, 9199496214 + ... + 9199498399.

It is an arithmetic number, because the mean of its divisors is an integer number (5032125026929).

Almost surely, 2^{20110101112009} is an apocalyptic number.

It is an amenable number.

20110101112009 is a deficient number, since it is larger than the sum of its proper divisors (18398995707).

20110101112009 is a wasteful number, since it uses less digits than its factorization.

20110101112009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18398995706.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 20110101112009 in words is "twenty trillion, one hundred ten billion, one hundred one million, one hundred twelve thousand, nine".