221221021222 has 8 divisors (see below), whose sum is σ = 333568870272. Its totient is φ = 110031397800.

The previous prime is 221221021157. The next prime is 221221021237. The reversal of 221221021222 is 222120122122.

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

It is a super-3 number, since 3×221221021222³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221221021222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289555929 + ... + 289556692.

It is an arithmetic number, because the mean of its divisors is an integer number (41696108784).

Almost surely, 2^221221021222 is an apocalyptic number.

221221021222 is a deficient number, since it is larger than the sum of its proper divisors (112347849050).

221221021222 is a wasteful number, since it uses less digits than its factorization.

221221021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579112814.

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

Adding to 221221021222 its reverse (222120122122), we get a palindrome (443341143344).

The spelling of 221221021222 in words is "two hundred twenty-one billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-two".