221233331221 has 8 divisors (see below), whose sum is σ = 253006776000. Its totient is φ = 189502057248.

The previous prime is 221233331167. The next prime is 221233331227. The reversal of 221233331221 is 122133332122.

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

It is not a de Polignac number, because 221233331221 - 2¹¹ = 221233329173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221233331227) 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, 10531456 + ... + 10552441.

It is an arithmetic number, because the mean of its divisors is an integer number (31625847000).

Almost surely, 2^221233331221 is an apocalyptic number.

It is an amenable number.

221233331221 is a deficient number, since it is larger than the sum of its proper divisors (31773444779).

221233331221 is a wasteful number, since it uses less digits than its factorization.

221233331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21085403.

The product of its digits is 2592, while the sum is 25.

Adding to 221233331221 its reverse (122133332122), we get a palindrome (343366663343).

Subtracting from 221233331221 its reverse (122133332122), we obtain a palindrome (99099999099).

The spelling of 221233331221 in words is "two hundred twenty-one billion, two hundred thirty-three million, three hundred thirty-one thousand, two hundred twenty-one".