221100221201 has 4 divisors (see below), whose sum is σ = 223289332404. Its totient is φ = 218911110000.

The previous prime is 221100221197. The next prime is 221100221203. The reversal of 221100221201 is 102122001122.

221100221201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 216061350976 + 5038870225 = 464824^2 + 70985^2 .

It is a cyclic number.

It is not a de Polignac number, because 221100221201 - 2² = 221100221197 is a prime.

It is a super-2 number, since 2×221100221201² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221100221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094555450 + ... + 1094555651.

It is an arithmetic number, because the mean of its divisors is an integer number (55822333101).

Almost surely, 2^221100221201 is an apocalyptic number.

It is an amenable number.

221100221201 is a deficient number, since it is larger than the sum of its proper divisors (2189111203).

221100221201 is a wasteful number, since it uses less digits than its factorization.

221100221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189111202.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221100221201 its reverse (102122001122), we get a palindrome (323222222323).

The spelling of 221100221201 in words is "two hundred twenty-one billion, one hundred million, two hundred twenty-one thousand, two hundred one".