20113110211 has 4 divisors (see below), whose sum is σ = 20113774632. Its totient is φ = 20112445792.

The previous prime is 20113110203. The next prime is 20113110229. The reversal of 20113110211 is 11201131102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20113110211 - 2³ = 20113110203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20113110191 and 20113110200.

It is not an unprimeable number, because it can be changed into a prime (20113113211) 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 3 ways as a sum of consecutive naturals, for example, 284521 + ... + 348106.

It is an arithmetic number, because the mean of its divisors is an integer number (5028443658).

Almost surely, 2^20113110211 is an apocalyptic number.

20113110211 is a deficient number, since it is larger than the sum of its proper divisors (664421).

20113110211 is an equidigital number, since it uses as much as digits as its factorization.

20113110211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664420.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20113110211 its reverse (11201131102), we get a palindrome (31314241313).

It can be divided in two parts, 201131102 and 11, that multiplied together give a palindrome (2212442122).

The spelling of 20113110211 in words is "twenty billion, one hundred thirteen million, one hundred ten thousand, two hundred eleven".