221201109 has 18 divisors (see below), whose sum is σ = 327518178. Its totient is φ = 143860800.

The previous prime is 221201083. The next prime is 221201117. The reversal of 221201109 is 901102122.

It can be written as a sum of positive squares in 3 ways, for example, as 62062884 + 159138225 = 7878^2 + 12615^2 .

It is not a de Polignac number, because 221201109 - 2⁷ = 221200981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221201091 and 221201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201179) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7819 + ... + 22439.

Almost surely, 2^221201109 is an apocalyptic number.

It is an amenable number.

221201109 is a deficient number, since it is larger than the sum of its proper divisors (106317069).

221201109 is a wasteful number, since it uses less digits than its factorization.

221201109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14709 (or 14665 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 221201109 is about 14872.8312368560. The cubic root of 221201109 is about 604.7776967110. Note that the first 3 decimals are identical.

The spelling of 221201109 in words is "two hundred twenty-one million, two hundred one thousand, one hundred nine".