221221222211 has 8 divisors (see below), whose sum is σ = 241343445504. Its totient is φ = 201100866120.

The previous prime is 221221222181. The next prime is 221221222223. The reversal of 221221222211 is 112222122122.

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

It is not a de Polignac number, because 221221222211 - 2⁶ = 221221222147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221227211) 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, 213071 + ... + 698456.

It is an arithmetic number, because the mean of its divisors is an integer number (30167930688).

Almost surely, 2^221221222211 is an apocalyptic number.

221221222211 is a deficient number, since it is larger than the sum of its proper divisors (20122223293).

221221222211 is a wasteful number, since it uses less digits than its factorization.

221221222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933601.

The product of its digits is 256, while the sum is 20.

Adding to 221221222211 its reverse (112222122122), we get a palindrome (333443344333).

The spelling of 221221222211 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".