221210011221 has 8 divisors (see below), whose sum is σ = 295837760544. Its totient is φ = 147027801360.

The previous prime is 221210011219. The next prime is 221210011229. The reversal of 221210011221 is 122110012122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221210011221 - 2¹ = 221210011219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221210011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210011229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111383706 + ... + 111385691.

It is an arithmetic number, because the mean of its divisors is an integer number (36979720068).

Almost surely, 2^221210011221 is an apocalyptic number.

It is an amenable number.

221210011221 is a deficient number, since it is larger than the sum of its proper divisors (74627749323).

221210011221 is a wasteful number, since it uses less digits than its factorization.

221210011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222769731.

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

Adding to 221210011221 its reverse (122110012122), we get a palindrome (343320023343).

Subtracting from 221210011221 its reverse (122110012122), we obtain a palindrome (99099999099).

The spelling of 221210011221 in words is "two hundred twenty-one billion, two hundred ten million, eleven thousand, two hundred twenty-one".