22011222221 has 4 divisors (see below), whose sum is σ = 22012033344.
Its totient is φ = 22010411100.
The previous prime is 22011222197. The next prime is 22011222223. The reversal of 22011222221 is 12222211022.
Adding to 22011222221 its reverse (12222211022), we get a palindrome (34233433243).
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 22011222221 - 214 = 22011205837 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 22011222221.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (22011222223) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363395 + ... + 419616.
It is an arithmetic number, because the mean of its divisors is an integer number (5503008336).
Almost surely, 222011222221 is an apocalyptic number.
It is an amenable number.
22011222221 is a deficient number, since it is larger than the sum of its proper divisors (811123).
22011222221 is an equidigital number, since it uses as much as digits as its factorization.
22011222221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 811122.
The product of its (nonzero) digits is 128, while the sum is 17.
The spelling of 22011222221 in words is "twenty-two billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".