221033121221 has 8 divisors (see below), whose sum is σ = 241184109600. Its totient is φ = 200891644240.

The previous prime is 221033121209. The next prime is 221033121229. The reversal of 221033121221 is 122121330122.

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 221033121221 - 2⁶ = 221033121157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221033121193 and 221033121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221033121229) 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, 2329211 + ... + 2422248.

It is an arithmetic number, because the mean of its divisors is an integer number (30148013700).

Almost surely, 2^221033121221 is an apocalyptic number.

It is an amenable number.

221033121221 is a deficient number, since it is larger than the sum of its proper divisors (20150988379).

221033121221 is a wasteful number, since it uses less digits than its factorization.

221033121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755699.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221033121221 its reverse (122121330122), we get a palindrome (343154451343).

The spelling of 221033121221 in words is "two hundred twenty-one billion, thirty-three million, one hundred twenty-one thousand, two hundred twenty-one".