221000011 has 4 divisors (see below), whose sum is σ = 224623024. Its totient is φ = 217377000.

The previous prime is 220999997. The next prime is 221000027. The reversal of 221000011 is 110000122.

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 221000011 - 2⁵ = 220999979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220999958 and 221000003.

It is not an unprimeable number, because it can be changed into a prime (221000071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811415 + ... + 1811536.

It is an arithmetic number, because the mean of its divisors is an integer number (56155756).

Almost surely, 2^221000011 is an apocalyptic number.

221000011 is a deficient number, since it is larger than the sum of its proper divisors (3623013).

221000011 is an equidigital number, since it uses as much as digits as its factorization.

221000011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623012.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 221000011 is about 14866.0691172885. The cubic root of 221000011 is about 604.5943696322.

Adding to 221000011 its reverse (110000122), we get a palindrome (331000133).

The spelling of 221000011 in words is "two hundred twenty-one million, eleven", and thus it is an aban number.