210011221111 has 4 divisors (see below), whose sum is σ = 219142143792. Its totient is φ = 200880298432.

The previous prime is 210011221087. The next prime is 210011221181. The reversal of 210011221111 is 111122110012.

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 210011221111 - 2¹¹ = 210011219063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210011221091 and 210011221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210011221181) 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, 4565461306 + ... + 4565461351.

It is an arithmetic number, because the mean of its divisors is an integer number (54785535948).

Almost surely, 2^210011221111 is an apocalyptic number.

210011221111 is a deficient number, since it is larger than the sum of its proper divisors (9130922681).

210011221111 is an equidigital number, since it uses as much as digits as its factorization.

210011221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9130922680.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210011221111 its reverse (111122110012), we get a palindrome (321133331123).

The spelling of 210011221111 in words is "two hundred ten billion, eleven million, two hundred twenty-one thousand, one hundred eleven".