221001112002221 has 16 divisors (see below), whose sum is σ = 223303761299520. Its totient is φ = 218704574081280.

The previous prime is 221001112002217. The next prime is 221001112002239. The reversal of 221001112002221 is 122200211100122.

It is a cyclic number.

It is not a de Polignac number, because 221001112002221 - 2² = 221001112002217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221001112002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001112002421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3015355586 + ... + 3015428876.

It is an arithmetic number, because the mean of its divisors is an integer number (13956485081220).

Almost surely, 2^{221001112002221} is an apocalyptic number.

It is an amenable number.

221001112002221 is a deficient number, since it is larger than the sum of its proper divisors (2302649297299).

221001112002221 is a wasteful number, since it uses less digits than its factorization.

221001112002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114556.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221001112002221 its reverse (122200211100122), we get a palindrome (343201323102343).

The spelling of 221001112002221 in words is "two hundred twenty-one trillion, one billion, one hundred twelve million, two thousand, two hundred twenty-one".