20113220111 has 4 divisors (see below), whose sum is σ = 20113609824. Its totient is φ = 20112830400.

The previous prime is 20113220027. The next prime is 20113220177. The reversal of 20113220111 is 11102231102.

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 20113220111 - 2²⁶ = 20046111247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113220011) 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, 103010 + ... + 225471.

It is an arithmetic number, because the mean of its divisors is an integer number (5028402456).

Almost surely, 2^20113220111 is an apocalyptic number.

20113220111 is a deficient number, since it is larger than the sum of its proper divisors (389713).

20113220111 is an equidigital number, since it uses as much as digits as its factorization.

20113220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389712.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20113220111 its reverse (11102231102), we get a palindrome (31215451213).

The spelling of 20113220111 in words is "twenty billion, one hundred thirteen million, two hundred twenty thousand, one hundred eleven".