221111100221 has 8 divisors (see below), whose sum is σ = 241216718688. Its totient is φ = 201006250000.

The previous prime is 221111100191. The next prime is 221111100227. The reversal of 221111100221 is 122001111122.

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

It is a cyclic number.

It is not a de Polignac number, because 221111100221 - 2⁶ = 221111100157 is a prime.

It is a super-2 number, since 2×221111100221² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221111100196 and 221111100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111100227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526706 + ... + 848316.

It is an arithmetic number, because the mean of its divisors is an integer number (30152089836).

Almost surely, 2^221111100221 is an apocalyptic number.

It is an amenable number.

221111100221 is a deficient number, since it is larger than the sum of its proper divisors (20105618467).

221111100221 is a wasteful number, since it uses less digits than its factorization.

221111100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384123.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221111100221 its reverse (122001111122), we get a palindrome (343112211343).

The spelling of 221111100221 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred thousand, two hundred twenty-one".