221201111011 has 4 divisors (see below), whose sum is σ = 221415246712. Its totient is φ = 220986975312.

The previous prime is 221201110997. The next prime is 221201111029. The reversal of 221201111011 is 110111102122.

It is a happy number.

221201111011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221201111011 - 2¹⁷ = 221200979939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201110982 and 221201111000.

It is not an unprimeable number, because it can be changed into a prime (221201141011) 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, 107066301 + ... + 107068366.

It is an arithmetic number, because the mean of its divisors is an integer number (55353811678).

Almost surely, 2^221201111011 is an apocalyptic number.

221201111011 is a deficient number, since it is larger than the sum of its proper divisors (214135701).

221201111011 is a wasteful number, since it uses less digits than its factorization.

221201111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214135700.

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

Adding to 221201111011 its reverse (110111102122), we get a palindrome (331312213133).

The spelling of 221201111011 in words is "two hundred twenty-one billion, two hundred one million, one hundred eleven thousand, eleven".