20112011111 has 8 divisors (see below), whose sum is σ = 20178522000. Its totient is φ = 20045551680.

The previous prime is 20112011107. The next prime is 20112011149. The reversal of 20112011111 is 11111021102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20112011111 - 2² = 20112011107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112011092 and 20112011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112011011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868400 + ... + 891258.

It is an arithmetic number, because the mean of its divisors is an integer number (2522315250).

Almost surely, 2^20112011111 is an apocalyptic number.

20112011111 is a deficient number, since it is larger than the sum of its proper divisors (66510889).

20112011111 is a wasteful number, since it uses less digits than its factorization.

20112011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25729.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20112011111 its reverse (11111021102), we get a palindrome (31223032213).

Subtracting from 20112011111 its reverse (11111021102), we obtain a palindrome (9000990009).

The spelling of 20112011111 in words is "twenty billion, one hundred twelve million, eleven thousand, one hundred eleven".