1222122216 has 32 divisors (see below), whose sum is σ = 3491778240. Its totient is φ = 349177728.

The previous prime is 1222122211. The next prime is 1222122217. The reversal of 1222122216 is 6122212221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1222122192 and 1222122201.

It is not an unprimeable number, because it can be changed into a prime (1222122211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3637101 + ... + 3637436.

It is an arithmetic number, because the mean of its divisors is an integer number (109118070).

Almost surely, 2^1222122216 is an apocalyptic number.

It is an amenable number.

1222122216 is an abundant number, since it is smaller than the sum of its proper divisors (2269656024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222122216 is a wasteful number, since it uses less digits than its factorization.

1222122216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7274553 (or 7274549 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 1222122216 is about 34958.8646268725. The cubic root of 1222122216 is about 1069.1489479859.

Adding to 1222122216 its reverse (6122212221), we get a palindrome (7344334437).

The spelling of 1222122216 in words is "one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred sixteen".