221201222009 has 8 divisors (see below), whose sum is σ = 223416652680. Its totient is φ = 218986288000.

The previous prime is 221201221987. The next prime is 221201222089. The reversal of 221201222009 is 900222102122.

221201222009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 128421889600 + 92779332409 = 358360^2 + 304597^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221201222009 - 2²⁰ = 221200173433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221201222089) 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 7 ways as a sum of consecutive naturals, for example, 805727 + ... + 1044795.

It is an arithmetic number, because the mean of its divisors is an integer number (27927081585).

Almost surely, 2^221201222009 is an apocalyptic number.

It is an amenable number.

221201222009 is a deficient number, since it is larger than the sum of its proper divisors (2215430671).

221201222009 is a wasteful number, since it uses less digits than its factorization.

221201222009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248331.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 221201222009 in words is "two hundred twenty-one billion, two hundred one million, two hundred twenty-two thousand, nine".