20111202011 has 16 divisors (see below), whose sum is σ = 21422633760. Its totient is φ = 18814341120.

The previous prime is 20111201969. The next prime is 20111202049. The reversal of 20111202011 is 11020211102.

It is a cyclic number.

It is not a de Polignac number, because 20111202011 - 2¹⁰ = 20111200987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111201983 and 20111202001.

It is not an unprimeable number, because it can be changed into a prime (20111202311) 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, 2326880 + ... + 2335506.

It is an arithmetic number, because the mean of its divisors is an integer number (1338914610).

Almost surely, 2^20111202011 is an apocalyptic number.

20111202011 is a deficient number, since it is larger than the sum of its proper divisors (1311431749).

20111202011 is a wasteful number, since it uses less digits than its factorization.

20111202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9454.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20111202011 its reverse (11020211102), we get a palindrome (31131413113).

Subtracting from 20111202011 its reverse (11020211102), we obtain a palindrome (9090990909).

The spelling of 20111202011 in words is "twenty billion, one hundred eleven million, two hundred two thousand, eleven".