20111002011 has 6 divisors (see below), whose sum is σ = 29049225140. Its totient is φ = 13407334668.

The previous prime is 20111001971. The next prime is 20111002027. The reversal of 20111002011 is 11020011102.

It is a happy number.

It is not a de Polignac number, because 20111002011 - 2²³ = 20102613403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2234555779 = 20111002011 / (2 + 0 + 1 + 1 + 1 + 0 + 0 + 2 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111001984 and 20111002002.

It is not an unprimeable number, because it can be changed into a prime (20111002211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117277881 + ... + 1117277898.

Almost surely, 2^20111002011 is an apocalyptic number.

20111002011 is a deficient number, since it is larger than the sum of its proper divisors (8938223129).

20111002011 is a wasteful number, since it uses less digits than its factorization.

20111002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234555785 (or 2234555782 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20111002011 its reverse (11020011102), we get a palindrome (31131013113).

Subtracting from 20111002011 its reverse (11020011102), we obtain a palindrome (9090990909).

The spelling of 20111002011 in words is "twenty billion, one hundred eleven million, two thousand, eleven".