20111110001001 has 16 divisors (see below), whose sum is σ = 29838246278400. Its totient is φ = 13387602509424.

The previous prime is 20111110000957. The next prime is 20111110001029. The reversal of 20111110001001 is 10010001111102.

It is not a de Polignac number, because 20111110001001 - 2⁶ = 20111110000937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20111110001401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550096881 + ... + 550133438.

It is an arithmetic number, because the mean of its divisors is an integer number (1864890392400).

Almost surely, 2^{20111110001001} is an apocalyptic number.

It is an amenable number.

20111110001001 is a deficient number, since it is larger than the sum of its proper divisors (9727136277399).

20111110001001 is a wasteful number, since it uses less digits than its factorization.

20111110001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100231005 (or 1100230999 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 20111110001001 its reverse (10010001111102), we get a palindrome (30121111112103).

The spelling of 20111110001001 in words is "twenty trillion, one hundred eleven billion, one hundred ten million, one thousand, one".