221101001209 has 16 divisors (see below), whose sum is σ = 241979564736. Its totient is φ = 200352499200.

The previous prime is 221101001203. The next prime is 221101001237. The reversal of 221101001209 is 902100101122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221101001209 - 2³ = 221101001201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221101001201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27134874 + ... + 27143020.

It is an arithmetic number, because the mean of its divisors is an integer number (15123722796).

Almost surely, 2^221101001209 is an apocalyptic number.

It is an amenable number.

221101001209 is a deficient number, since it is larger than the sum of its proper divisors (20878563527).

221101001209 is a wasteful number, since it uses less digits than its factorization.

221101001209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15816.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 221101001209 in words is "two hundred twenty-one billion, one hundred one million, one thousand, two hundred nine".