221220201111209 has 8 divisors (see below), whose sum is σ = 232740567551688. Its totient is φ = 209991489517440.

The previous prime is 221220201111199. The next prime is 221220201111229. The reversal of 221220201111209 is 902111102022122.

It can be written as a sum of positive squares in 4 ways, for example, as 2123513443984 + 219096687667225 = 1457228^2 + 14801915^2 .

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 221220201111209 - 2⁴ = 221220201111193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221220201111229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72913710122 + ... + 72913713155.

It is an arithmetic number, because the mean of its divisors is an integer number (29092570943961).

Almost surely, 2^{221220201111209} is an apocalyptic number.

It is an amenable number.

221220201111209 is a deficient number, since it is larger than the sum of its proper divisors (11520366440479).

221220201111209 is a wasteful number, since it uses less digits than its factorization.

221220201111209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145827423355.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 221220201111209 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred one million, one hundred eleven thousand, two hundred nine".