221100000121221 has 16 divisors (see below), whose sum is σ = 317972207098560. Its totient is φ = 135849274030080.

The previous prime is 221100000121219. The next prime is 221100000121229. The reversal of 221100000121221 is 122121000001122.

It is not a de Polignac number, because 221100000121221 - 2¹ = 221100000121219 is a prime.

It is a super-3 number, since 3×221100000121221³ (a number of 44 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221100000121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100000121229) 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, 4422151891 + ... + 4422201888.

It is an arithmetic number, because the mean of its divisors is an integer number (19873262943660).

Almost surely, 2^{221100000121221} is an apocalyptic number.

It is an amenable number.

221100000121221 is a deficient number, since it is larger than the sum of its proper divisors (96872206977339).

221100000121221 is a wasteful number, since it uses less digits than its factorization.

221100000121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8844354436.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221100000121221 its reverse (122121000001122), we get a palindrome (343221000122343).

The spelling of 221100000121221 in words is "two hundred twenty-one trillion, one hundred billion, one hundred twenty-one thousand, two hundred twenty-one".