21220100110221 has 8 divisors (see below), whose sum is σ = 28293488536320. Its totient is φ = 14146722545472.

The previous prime is 21220100110217. The next prime is 21220100110241. The reversal of 21220100110221 is 12201100102212.

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

It is not a de Polignac number, because 21220100110221 - 2² = 21220100110217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220100110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220100110211) 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 7 ways as a sum of consecutive naturals, for example, 4872325 + ... + 8135093.

It is an arithmetic number, because the mean of its divisors is an integer number (3536686067040).

Almost surely, 2^{21220100110221} is an apocalyptic number.

It is an amenable number.

21220100110221 is a deficient number, since it is larger than the sum of its proper divisors (7073388426099).

21220100110221 is a wasteful number, since it uses less digits than its factorization.

21220100110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430675.

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

Adding to 21220100110221 its reverse (12201100102212), we get a palindrome (33421200212433).

The spelling of 21220100110221 in words is "twenty-one trillion, two hundred twenty billion, one hundred million, one hundred ten thousand, two hundred twenty-one".