221222201221 has 8 divisors (see below), whose sum is σ = 256386294144. Its totient is φ = 186948338640.

The previous prime is 221222201191. The next prime is 221222201227. The reversal of 221222201221 is 122102222122.

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

It is not a de Polignac number, because 221222201221 - 2⁹ = 221222200709 is a prime.

It is a super-2 number, since 2×221222201221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222201227) 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, 222557050 + ... + 222558043.

It is an arithmetic number, because the mean of its divisors is an integer number (32048286768).

Almost surely, 2^221222201221 is an apocalyptic number.

It is an amenable number.

221222201221 is a deficient number, since it is larger than the sum of its proper divisors (35164092923).

221222201221 is an equidigital number, since it uses as much as digits as its factorization.

221222201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445115171.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221222201221 its reverse (122102222122), we get a palindrome (343324423343).

The spelling of 221222201221 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".