20111100211 has 4 divisors (see below), whose sum is σ = 20146321624. Its totient is φ = 20075878800.

The previous prime is 20111100209. The next prime is 20111100227. The reversal of 20111100211 is 11200111102.

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 20111100211 - 2¹ = 20111100209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111109211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17609850 + ... + 17610991.

It is an arithmetic number, because the mean of its divisors is an integer number (5036580406).

Almost surely, 2^20111100211 is an apocalyptic number.

20111100211 is a deficient number, since it is larger than the sum of its proper divisors (35221413).

20111100211 is an equidigital number, since it uses as much as digits as its factorization.

20111100211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35221412.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111100211 its reverse (11200111102), we get a palindrome (31311211313).

The spelling of 20111100211 in words is "twenty billion, one hundred eleven million, one hundred thousand, two hundred eleven".