210111111011 has 12 divisors (see below), whose sum is σ = 211635755088. Its totient is φ = 208596542112.

The previous prime is 210111110999. The next prime is 210111111029. The reversal of 210111111011 is 110111111012.

It is a happy number.

It is not a de Polignac number, because 210111111011 - 2⁶ = 210111110947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210111110983 and 210111111001.

It is not an unprimeable number, because it can be changed into a prime (210111111061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18894425 + ... + 18905541.

It is an arithmetic number, because the mean of its divisors is an integer number (17636312924).

Almost surely, 2^210111111011 is an apocalyptic number.

210111111011 is a deficient number, since it is larger than the sum of its proper divisors (1524644077).

210111111011 is an equidigital number, since it uses as much as digits as its factorization.

210111111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11998 (or 11801 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 210111111011 its reverse (110111111012), we get a palindrome (320222222023).

Subtracting from 210111111011 its reverse (110111111012), we obtain a palindrome (99999999999).

The spelling of 210111111011 in words is "two hundred ten billion, one hundred eleven million, one hundred eleven thousand, eleven".