2212122221 has 8 divisors (see below), whose sum is σ = 2340814464. Its totient is φ = 2086139440.

The previous prime is 2212122197. The next prime is 2212122251. The reversal of 2212122221 is 1222212122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2212122221 - 2²⁶ = 2145013357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2212122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212122251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675686 + ... + 678951.

It is an arithmetic number, because the mean of its divisors is an integer number (292601808).

Almost surely, 2^2212122221 is an apocalyptic number.

It is an amenable number.

2212122221 is a deficient number, since it is larger than the sum of its proper divisors (128692243).

2212122221 is a wasteful number, since it uses less digits than its factorization.

2212122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354731.

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

The square root of 2212122221 is about 47033.2033886700. The cubic root of 2212122221 is about 1302.9758692377.

Adding to 2212122221 its reverse (1222212122), we get a palindrome (3434334343).

The spelling of 2212122221 in words is "two billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".