201221001209 has 32 divisors (see below), whose sum is σ = 228289536000. Its totient is φ = 176352612480.

The previous prime is 201221001193. The next prime is 201221001227. The reversal of 201221001209 is 902100122102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 201221001209 - 2⁴ = 201221001193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201221001229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29163242 + ... + 29170140.

It is an arithmetic number, because the mean of its divisors is an integer number (7134048000).

Almost surely, 2^201221001209 is an apocalyptic number.

It is an amenable number.

201221001209 is a deficient number, since it is larger than the sum of its proper divisors (27068534791).

201221001209 is a wasteful number, since it uses less digits than its factorization.

201221001209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9125.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 201221001209 in words is "two hundred one billion, two hundred twenty-one million, one thousand, two hundred nine".