221121112021201 has 16 divisors (see below), whose sum is σ = 254826291126400. Its totient is φ = 187948242183168.

The previous prime is 221121112021177. The next prime is 221121112021207. The reversal of 221121112021201 is 102120211121122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221121112021201 - 2⁴⁵ = 185936739932369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121112021207) 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 15 ways as a sum of consecutive naturals, for example, 132380496 + ... + 134040433.

It is an arithmetic number, because the mean of its divisors is an integer number (15926643195400).

Almost surely, 2^{221121112021201} is an apocalyptic number.

It is an amenable number.

221121112021201 is a deficient number, since it is larger than the sum of its proper divisors (33705179105199).

221121112021201 is a wasteful number, since it uses less digits than its factorization.

221121112021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266421928.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221121112021201 its reverse (102120211121122), we get a palindrome (323241323142323).

The spelling of 221121112021201 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, twenty-one thousand, two hundred one".