1222212211 has 8 divisors (see below), whose sum is σ = 1346524848. Its totient is φ = 1100100000.

The previous prime is 1222212197. The next prime is 1222212217. The reversal of 1222212211 is 1122122221.

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 1222212211 - 2¹¹ = 1222210163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222212217) 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, 548940 + ... + 551161.

It is an arithmetic number, because the mean of its divisors is an integer number (168315606).

Almost surely, 2^1222212211 is an apocalyptic number.

1222212211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1222212211 is a deficient number, since it is larger than the sum of its proper divisors (124312637).

1222212211 is a wasteful number, since it uses less digits than its factorization.

1222212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100213.

The product of its digits is 64, while the sum is 16.

The square root of 1222212211 is about 34960.1517588239. The cubic root of 1222212211 is about 1069.1751907780.

Adding to 1222212211 its reverse (1122122221), we get a palindrome (2344334432).

The spelling of 1222212211 in words is "one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred eleven".