2212221221 has 8 divisors (see below), whose sum is σ = 2531598720. Its totient is φ = 1893680208.

The previous prime is 2212221173. The next prime is 2212221241. The reversal of 2212221221 is 1221222122.

It is a happy number.

2212221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-2212221221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2212221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212221241) 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, 203441 + ... + 214038.

It is an arithmetic number, because the mean of its divisors is an integer number (316449840).

Almost surely, 2^2212221221 is an apocalyptic number.

It is an amenable number.

2212221221 is a deficient number, since it is larger than the sum of its proper divisors (319377499).

2212221221 is an equidigital number, since it uses as much as digits as its factorization.

2212221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418243.

The product of its digits is 128, while the sum is 17.

The square root of 2212221221 is about 47034.2558248773. The cubic root of 2212221221 is about 1302.9953064830.

Adding to 2212221221 its reverse (1221222122), we get a palindrome (3433443343).

Subtracting from 2212221221 its reverse (1221222122), we obtain a palindrome (990999099).

The spelling of 2212221221 in words is "two billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".