20111101011 has 8 divisors (see below), whose sum is σ = 29794223760. Its totient is φ = 13407400656.

The previous prime is 20111101009. The next prime is 20111101051. The reversal of 20111101011 is 11010111102.

It is not a de Polignac number, because 20111101011 - 2¹ = 20111101009 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 20111100984 and 20111101002.

It is not an unprimeable number, because it can be changed into a prime (20111101051) 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, 372427770 + ... + 372427823.

It is an arithmetic number, because the mean of its divisors is an integer number (3724277970).

Almost surely, 2^20111101011 is an apocalyptic number.

20111101011 is a deficient number, since it is larger than the sum of its proper divisors (9683122749).

20111101011 is an equidigital number, since it uses as much as digits as its factorization.

20111101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744855602 (or 744855596 counting only the distinct ones).

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

Adding to 20111101011 its reverse (11010111102), we get a palindrome (31121212113).

The spelling of 20111101011 in words is "twenty billion, one hundred eleven million, one hundred one thousand, eleven".