1216222224 has 160 divisors (see below), whose sum is σ = 3844992000. Its totient is φ = 323523072.

The previous prime is 1216222199. The next prime is 1216222229. The reversal of 1216222224 is 4222226121.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 = 1216222194 and 1216222203.

It is not an unprimeable number, because it can be changed into a prime (1216222229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 375042 + ... + 378270.

It is an arithmetic number, because the mean of its divisors is an integer number (24031200).

Almost surely, 2^1216222224 is an apocalyptic number.

1216222224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216222224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922496000).

1216222224 is an abundant number, since it is smaller than the sum of its proper divisors (2628769776).

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

1216222224 is a wasteful number, since it uses less digits than its factorization.

1216222224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325 (or 3319 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 1216222224 is about 34874.3777578898. The cubic root of 1216222224 is about 1067.4256755819.

Adding to 1216222224 its reverse (4222226121), we get a palindrome (5438448345).

The spelling of 1216222224 in words is "one billion, two hundred sixteen million, two hundred twenty-two thousand, two hundred twenty-four".